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Condensed Consolidated Balance Sheets (Unaudited) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Current Assets:    
Cash and cash equivalents $ 1,755,131 $ 392,810
Certificates of deposit 5,385,000 7,088,000
Accounts receivable, net 5,863,016 [1] 4,577,932 [1]
Inventories, net 5,284,492 4,936,372
Deferred tax assets 428,191 416,191
Other current assets 318,003 422,332
Total current assets 19,033,833 17,833,637
Property, Plant and Equipment:    
Land 923,587 923,587
Land improvements 314,563 314,563
Buildings and improvements 6,257,974 6,244,064
Production equipment and other 29,564,445 29,495,765
Property, Plant and Equipment Gross 37,060,569 36,977,979
Less accumulated depreciation 29,165,694 28,900,113
Net property, plant and equipment 7,894,875 8,077,866
Total assets 26,928,708 25,911,503
Current Liabilities:    
Accounts payable 1,534,591 1,003,647
Accrued wages and salaries 655,726 409,695
Other accrued expenses 475,072 460,245
Unearned revenue and customer deposits 73,696 84,905
Total current liabilities 2,739,085 1,958,492
Deferred income taxes 880,275 952,275
Total liabilities 3,619,360 2,910,767
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 25,646,216 25,337,604
Treasury stock (3,922,098) [4] (3,922,098) [4]
Total shareholders' equity 23,309,348 23,000,736
Total liabilities and shareholders' equity $ 26,928,708 $ 25,911,503
[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.