Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 3,075,766	$ 2,567,731
Certificates of deposit	2,990,000	4,733,000
Accounts receivable - Less allowances of $170,000	6,869,891	5,163,450
Inventories, net	6,311,960	5,153,294
Prepaid income taxes	0	85,940
Other current assets	384,811	383,772
Total current assets	19,632,428	18,087,187
Property, Plant and Equipment:
Land and improvements	1,636,749	1,636,749
Buildings and improvements	8,449,768	8,440,738
Production equipment and other	36,344,494	36,333,550
Property, Plant and Equipment, Gross	46,431,011	46,411,037
Less accumulated depreciation	33,509,910	33,260,153
Net property, plant and equipment	12,921,101	13,150,884
Total assets	32,553,529	31,238,071
Current Liabilities:
Accounts payable	1,135,304	466,424
Accrued wages and salaries	686,571	482,008
Other accrued expenses	317,568	322,968
Unearned revenue and customer deposits	205,774	249,498
Federal and state income taxes	194,560	0
Total current liabilities	2,539,777	1,520,898
Deferred income taxes	980,084	1,011,084
Total liabilities	3,519,861	2,531,982
Shareholders' Equity:
Preferred stock, no par value, 500,000 shares authorized: none outstanding	0	0
Common stock, $1.00 par value, 4,000,000 shares authorized, 1,138,096 shares issued; 966,132 shares outstanding	1,138,096	1,138,096
Additional paid-in capital	447,134	447,134
Retained earnings	31,370,536	31,042,957
Treasury stock, 171,964 shares at cost	(3,922,098)	(3,922,098)
Total shareholders' equity	29,033,668	28,706,089
Total liabilities and shareholders' equity	$ 32,553,529	$ 31,238,071