Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 2,265,723	$ 4,045,101
Certificates of deposit	2,193,000	2,691,000
Accounts receivable - Less allowance of $160,000	6,173,074	4,975,137
Inventories, net	9,998,952	9,121,230
Prepaid income taxes	672,119	509,119
Other current assets	420,199	422,747
Total current assets	21,723,067	21,764,334
Property, Plant and Equipment
Land and improvements	1,510,513	1,510,513
Buildings and improvements	6,758,266	6,758,266
Production equipment and other	37,494,180	37,080,762
Property, Plant and Equipment, Gross	45,762,959	45,349,541
Less accumulated depreciation	33,793,779	33,487,748
Net property, plant and equipment	11,969,180	11,861,793
Total assets	33,692,247	33,626,127
Current Liabilities
Accounts payable	1,621,403	697,235
Accrued wages and salaries	675,078	462,332
Other accrued expenses	115,734	327,961
Unearned revenue and customer deposits	183,836	203,717
Total current liabilities	2,596,051	1,691,245
Deferred income taxes	905,084	948,084
Total liabilities	3,501,135	2,639,329
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	32,527,980	33,323,666
Treasury stock, 171,964 shares at cost	(3,922,098)	(3,922,098)
Total shareholders' equity	30,191,112	30,986,798
Total liabilities and shareholders' equity	$ 33,692,247	$ 33,626,127