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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Current Assets:    
Cash and cash equivalents $ 737,073 $ 443,608
Certificates of deposit 5,460,348 6,207,348
Accounts receivable, net 6,458,610 [1] 5,510,770 [1]
Inventories, net 5,153,432 4,880,788
Deferred income taxes 423,191 410,191
Other current assets 319,492 295,521
Total current assets 18,552,146 17,748,226
Property, Plant and Equipment:    
Land 923,587 923,587
Land improvements 314,563 314,563
Buildings and improvements 6,438,022 6,438,022
Production equipment and other 32,288,421 31,806,103
Property, Plant and Equipment Gross 39,964,593 39,482,275
Less accumulated depreciation 29,310,181 29,073,155
Net property, plant and equipment 10,654,412 10,409,120
Total assets 29,206,558 28,157,346
Current Liabilities:    
Accounts payable 1,793,079 924,943
Accrued wages and salaries 780,508 560,114
Other accrued expenses 592,872 609,846
Unearned revenue and customer deposits 75,706 126,066
Total current liabilities 3,242,165 2,220,969
Deferred income taxes 1,085,275 1,065,275
Total liabilities 4,327,440 3,286,244
Shareholders' Equity:    
Preferred stock 0 [2] 0 [2]
Common stock 1,138,096 [3] 1,138,096 [3]
Additional paid-in capital 447,134 447,134
Retained earnings 27,215,986 27,207,970
Less: Treasury stock 3,922,098 [4] 3,922,098 [4]
Total shareholders' equity 24,879,118 24,871,102
Total liabilities and shareholders' equity $ 29,206,558 $ 28,157,346
[1] Net of allowance of $150,000.
[2] No par value, 500,000 shares authorized, none outstanding.
[3] $1.00 par value, 4,000,000 shares authorized, 1,138,096 shares issued, 966,132 shares outstanding.
[4] At cost, 171,964 shares.