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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Current Assets:    
Cash and cash equivalents $ 1,287,212 $ 1,152,569
Certificates of deposit 7,063,000 7,810,000
Accounts receivable - Less allowances of $140,000 6,907,426 5,326,650
Inventories, net 5,450,221 4,528,100
Prepaid income taxes 0 84,112
Other current assets 330,476 357,918
Total current assets 21,038,335 19,259,349
Property, Plant and Equipment    
Land and improvements 1,535,434 1,535,434
Buildings and improvements 8,039,831 8,039,831
Production equipment and other 35,005,062 34,607,507
Property, Plant and Equipment, Gross 44,580,327 44,182,772
Less accumulated depreciation 32,041,193 31,625,819
Net property, plant and equipment 12,539,134 12,556,953
Total assets 33,577,469 31,816,302
Current Liabilities:    
Accounts payable 1,516,822 737,040
Accrued wages and salaries 921,288 674,316
Other accrued expenses 632,485 495,132
Unearned revenue and customer deposits 221,570 312,775
Total current liabilities 3,292,165 2,219,263
Deferred income taxes 710,084 737,084
Total liabilities 4,002,249 2,956,347
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 31,912,088 31,196,823
Treasury stock, 171,964 shares at cost 3,922,098 3,922,098
Total shareholders' equity 29,575,220 28,859,955
Total liabilities and shareholders' equity $ 33,577,469 $ 31,816,302