| 2013年 3月31日 | 2014年 3月31日 | 2015年 3月31日 | 2016年 3月31日 | 2017年 3月31日 | 2018年 3月31日 | 2019年 3月31日 | 2020年 3月31日 | 2021年 3月31日 | 2022年 3月31日 | 2023年 3月31日 | |
| 現金及び預金 | - | 13,031 | 11,185 | 10,908 | 10,005 | 15,148 | 16,692 | 10,837 | 13,439 | 11,177 | 12,878 |
| 受取手形 | - | - | - | - | - | - | - | - | - | 2,519 | 2,775 |
| 売掛金 | - | - | - | - | - | - | - | - | - | 30,508 | 32,629 |
| 売掛金 | - | - | - | - | - | - | - | - | - | 30,508 | 32,629 |
| 製品 | - | 2,300 | 2,489 | 2,370 | 2,229 | 2,529 | 2,656 | 2,364 | 2,247 | 3,259 | 4,064 |
| 仕掛品 | - | 1,819 | 1,607 | 1,642 | 1,630 | 1,900 | 1,919 | 1,976 | 2,071 | 2,754 | 3,231 |
| 原材料及び貯蔵品 | - | 4,177 | 4,256 | 3,764 | 3,813 | 4,194 | 4,689 | 4,464 | 4,291 | 5,798 | 6,103 |
| その他 | - | 2,700 | 3,283 | 2,322 | 2,700 | 2,042 | 2,100 | 2,483 | 2,155 | 3,795 | 3,629 |
| 流動資産 | - | 46,205 | 45,149 | 41,138 | 43,668 | 50,422 | 53,165 | 45,363 | 51,741 | 59,813 | 65,312 |
| その他 | - | 2,700 | 3,283 | 2,322 | 2,700 | 2,042 | 2,100 | 2,483 | 2,155 | 3,795 | 3,629 |
| 流動資産 | - | 46,205 | 45,149 | 41,138 | 43,668 | 50,422 | 53,165 | 45,363 | 51,741 | 59,813 | 65,312 |
| 建物及び構築物 | - | 38,570 | 43,585 | 41,143 | 43,067 | 43,863 | 45,057 | 45,207 | 47,592 | 48,180 | 50,068 |
| 減価償却累計額 | - | -24,083 | -25,411 | -26,357 | -27,181 | -28,380 | -29,247 | -30,111 | -31,573 | -32,976 | -34,529 |
| 建物及び構築物(純額) | - | 14,486 | 18,174 | 14,785 | 15,885 | 15,482 | 15,810 | 15,095 | 16,018 | 15,203 | 15,539 |
| 機械装置及び運搬具 | - | 117,880 | 130,019 | 131,642 | 130,922 | 134,668 | 137,816 | 139,396 | 145,621 | 152,785 | 158,989 |
| 減価償却累計額 | - | -96,326 | -101,430 | -103,832 | -105,132 | -109,327 | -113,065 | -115,798 | -120,845 | -126,821 | -132,937 |
| 機械装置及び運搬具(純額) | - | 21,554 | 28,589 | 27,810 | 25,790 | 25,341 | 24,750 | 23,597 | 24,776 | 25,963 | 26,052 |
| 土地 | - | 17,473 | 17,658 | 15,830 | 15,714 | 15,488 | 16,273 | 16,275 | 16,263 | 16,366 | 16,477 |
| リース資産 | - | 882 | 1,760 | 1,341 | 1,378 | 1,476 | 1,482 | 773 | 502 | 202 | 261 |
| 減価償却累計額 | - | -495 | -676 | -511 | -640 | -796 | -934 | -519 | -318 | -119 | -157 |
| リース資産(純額) | - | 386 | 1,084 | 830 | 737 | 680 | 547 | 254 | 183 | 83 | 104 |
| 建設仮勘定 | - | 13,998 | 9,262 | 2,415 | 2,041 | 2,798 | 2,482 | 5,095 | 4,324 | 4,265 | 6,135 |
| 土地 | - | 17,473 | 17,658 | 15,830 | 15,714 | 15,488 | 16,273 | 16,275 | 16,263 | 16,366 | 16,477 |
| その他 | - | 10,775 | 11,027 | 11,707 | 11,694 | 11,534 | 11,484 | 11,732 | 11,765 | 12,261 | 13,242 |
| 減価償却累計額 | - | -8,973 | -9,639 | -10,278 | -10,501 | -10,462 | -10,468 | -10,606 | -10,867 | -11,135 | -11,666 |
| その他(純額) | - | 1,801 | 1,387 | 1,428 | 1,192 | 1,072 | 1,015 | 1,125 | 897 | 1,125 | 1,576 |
| リース資産(純額) | - | 386 | 1,084 | 830 | 737 | 680 | 547 | 254 | 183 | 83 | 104 |
| 有形固定資産 | - | 69,700 | 76,156 | 63,100 | 61,362 | 60,863 | 60,880 | 61,444 | 62,465 | 63,008 | 65,885 |
| 建設仮勘定 | - | 13,998 | 9,262 | 2,415 | 2,041 | 2,798 | 2,482 | 5,095 | 4,324 | 4,265 | 6,135 |
| 有形固定資産 | - | 69,700 | 76,156 | 63,100 | 61,362 | 60,863 | 60,880 | 61,444 | 62,465 | 63,008 | 65,885 |
| 無形固定資産 | - | 914 | 729 | 929 | 744 | 700 | 691 | 598 | 437 | 364 | 384 |
| 無形固定資産 | - | 914 | 729 | 929 | 744 | 700 | 691 | 598 | 437 | 364 | 384 |
| 投資有価証券 | - | 2,951 | 3,628 | 7,254 | 7,548 | 7,807 | 7,373 | 7,125 | 7,350 | 8,157 | 8,418 |
| その他 | - | 480 | 740 | 467 | 369 | 436 | 530 | 705 | 1,244 | 673 | 1,519 |
| 投資その他の資産 | - | 3,427 | 4,365 | 8,326 | 7,916 | 8,815 | 8,503 | 7,831 | 8,594 | 8,831 | 9,938 |
| その他 | - | 480 | 740 | 467 | 369 | 436 | 530 | 705 | 1,244 | 673 | 1,519 |
| 投資その他の資産 | - | 3,427 | 4,365 | 8,326 | 7,916 | 8,815 | 8,503 | 7,831 | 8,594 | 8,831 | 9,938 |
| 固定資産 | - | 74,042 | 81,251 | 72,357 | 70,022 | 70,378 | 70,074 | 69,874 | 71,497 | 72,203 | 76,208 |
| 資産 | - | 120,248 | 126,401 | 113,495 | 113,691 | 120,722 | 123,239 | 115,238 | 123,238 | 132,016 | 141,520 |
| 支払手形及び買掛金 | - | 18,873 | 17,772 | 16,162 | 13,885 | 16,019 | 15,753 | 11,122 | 11,107 | 10,967 | 11,613 |
| 電子記録債務 | - | - | 1,858 | 1,569 | 5,812 | 8,556 | 9,181 | 7,492 | 10,961 | 13,990 | 15,693 |
| 短期借入金 | - | 11,006 | 12,105 | 5,941 | 4,115 | 2,861 | 2,527 | 1,200 | 1,060 | 2,060 | 7,360 |
| リース債務 | - | 140 | 222 | 144 | 143 | 154 | 467 | 101 | 87 | 48 | 48 |
| リース債務 | - | 140 | 222 | 144 | 143 | 154 | 467 | 101 | 87 | 48 | 48 |
| 未払金 | - | 5,234 | 2,563 | 1,955 | 1,903 | 2,510 | 2,180 | 2,403 | 2,001 | 1,696 | 1,946 |
| 未払金 | - | 5,234 | 2,563 | 1,955 | 1,903 | 2,510 | 2,180 | 2,403 | 2,001 | 1,696 | 1,946 |
| 未払法人税等 | - | 989 | 1,572 | 167 | 1,093 | 1,164 | 513 | 534 | 124 | 658 | 653 |
| 賞与引当金 | - | 1,692 | 1,880 | 1,908 | 1,961 | 1,999 | 2,134 | 2,083 | 2,059 | 1,977 | 2,005 |
| 未払法人税等 | - | 989 | 1,572 | 167 | 1,093 | 1,164 | 513 | 534 | 124 | 658 | 653 |
| その他 | - | 4,807 | 6,962 | 5,561 | 5,481 | 5,338 | 6,266 | 5,361 | 4,534 | 5,592 | 6,150 |
| 流動負債 | - | 42,744 | 44,938 | 33,409 | 34,397 | 38,604 | 39,026 | 30,299 | 31,936 | 36,991 | 45,471 |
| 賞与引当金 | - | 1,692 | 1,880 | 1,908 | 1,961 | 1,999 | 2,134 | 2,083 | 2,059 | 1,977 | 2,005 |
| その他 | - | 4,807 | 6,962 | 5,561 | 5,481 | 5,338 | 6,266 | 5,361 | 4,534 | 5,592 | 6,150 |
| 流動負債 | - | 42,744 | 44,938 | 33,409 | 34,397 | 38,604 | 39,026 | 30,299 | 31,936 | 36,991 | 45,471 |
| 長期借入金 | - | 9,043 | 7,379 | 8,946 | 5,709 | 3,175 | 1,200 | - | 3,710 | 2,650 | 1,590 |
| リース債務 | - | 304 | 896 | 726 | 628 | 551 | 95 | 169 | 103 | 38 | 58 |
| 繰延税金負債 | - | - | - | - | - | - | 944 | 697 | 408 | 504 | - |
| 再評価に係る繰延税金負債 | - | 1,010 | 915 | 869 | 869 | 821 | 763 | 766 | 754 | 754 | 754 |
| 環境対策引当金 | - | 474 | 443 | 227 | 119 | 94 | 109 | 92 | 94 | 80 | 34 |
| 環境対策引当金 | - | 474 | 443 | 227 | 119 | 94 | 109 | 92 | 94 | 80 | 34 |
| 退職給付に係る負債 | - | 3,784 | 3,630 | 3,928 | 3,938 | 4,196 | 4,276 | 4,651 | 5,942 | 5,680 | 5,458 |
| その他 | - | 241 | 190 | 103 | 36 | 36 | 33 | 124 | 72 | 87 | 102 |
| その他 | - | 241 | 190 | 103 | 36 | 36 | 33 | 124 | 72 | 87 | 102 |
| 固定負債 | - | 16,746 | 15,092 | 16,500 | 12,934 | 10,592 | 7,423 | 6,501 | 11,086 | 9,796 | 7,999 |
| 固定負債 | - | 16,746 | 15,092 | 16,500 | 12,934 | 10,592 | 7,423 | 6,501 | 11,086 | 9,796 | 7,999 |
| 負債 | - | 59,491 | 60,030 | 49,909 | 47,332 | 49,196 | 46,449 | 36,801 | 43,022 | 46,788 | 53,471 |
| 資本金 | - | 5,500 | 5,500 | 5,500 | 5,500 | 5,500 | 5,500 | 5,500 | 5,500 | 5,500 | 5,500 |
| 資本剰余金 | - | 22,538 | 22,538 | 22,538 | 22,538 | 22,538 | 22,538 | 22,561 | 22,561 | 22,561 | 22,561 |
| 資本剰余金 | - | 22,538 | 22,538 | 22,538 | 22,538 | 22,538 | 22,538 | 22,561 | 22,561 | 22,561 | 22,561 |
| 利益剰余金 | - | 24,580 | 28,226 | 29,814 | 32,741 | 37,952 | 43,404 | 47,413 | 47,633 | 49,710 | 49,931 |
| 利益剰余金 | - | 24,580 | 28,226 | 29,814 | 32,741 | 37,952 | 43,404 | 47,413 | 47,633 | 49,710 | 49,931 |
| 自己株式 | - | -129 | -129 | -129 | -430 | -430 | -430 | -1,031 | -1,017 | -1,017 | -1,017 |
| 株主資本 | - | 52,489 | 56,136 | 57,723 | 60,350 | 65,560 | 71,012 | 74,444 | 74,677 | 76,754 | 76,975 |
| その他有価証券評価差額金 | - | 60 | 277 | 66 | 212 | 263 | 136 | -60 | 220 | 211 | 274 |
| 土地再評価差額金 | - | 1,543 | 1,639 | 1,684 | 1,685 | 1,576 | 1,444 | 1,440 | 1,412 | 1,412 | 1,412 |
| 評価・換算差額等 | - | 691 | 2,621 | 681 | 674 | 497 | -135 | -1,401 | -569 | 1,337 | 2,898 |
| 為替換算調整勘定 | - | -551 | 884 | -655 | -872 | -973 | -1,439 | -2,354 | -1,102 | 481 | 1,876 |
| 退職給付に係る調整累計額 | - | -361 | -180 | -414 | -350 | -368 | -276 | -427 | -1,099 | -767 | -665 |
| 評価・換算差額等 | - | 691 | 2,621 | 681 | 674 | 497 | -135 | -1,401 | -569 | 1,337 | 2,898 |
| 純資産 | 19,964 | 60,756 | 66,370 | 63,586 | 66,359 | 71,526 | 76,790 | 78,436 | 80,216 | 85,228 | 88,049 |
| 非支配株主持分 | - | - | 7,613 | 5,180 | 5,334 | 5,467 | 5,913 | 5,394 | 6,107 | 7,135 | 8,175 |
| 純資産 | 19,964 | 60,756 | 66,370 | 63,586 | 66,359 | 71,526 | 76,790 | 78,436 | 80,216 | 85,228 | 88,049 |
| 負債純資産 | - | 120,248 | 126,401 | 113,495 | 113,691 | 120,722 | 123,239 | 115,238 | 123,238 | 132,016 | 141,520 |