Balance Sheets (USD $)	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 1,748,382	$ 1,090,974
Marketable securities	7,743,946	9,295,755
Accounts receivable, net of allowance for doubtful accounts of $29,000 in 2012 and $18,000 in 2011	1,017,627	1,653,440
Receivable in connection with damage settlement	518,050
Inventories (net)	1,242,750	1,467,434
Prepaid expenses and other current assets	132,458	163,034
Prepaid income taxes	3,602	78,613
Deferred income taxes	216,588	223,546
Total current assets	12,623,403	13,972,796
Property, plant, and equipment:
Land	69,000	69,000
Factory equipment and fixtures	3,842,927	3,694,379
Building and improvements	2,725,993	2,714,780
Waste disposal plant	133,532	133,532
Total property, plant and equipment	6,771,452	6,611,691
Less accumulated depreciation	5,535,589	5,366,204
Net property, plant, and equipment	1,235,863	1,245,487
Other asset		37,672
Total assets	13,859,266	15,255,955
Current liabilities:
Accounts payable	151,385	400,389
Accrued expenses	676,123	676,959
Total current liabilities	827,508	1,077,348
Deferred income taxes	193,740	64,578
Common stock, $.10 par value; 10,000,000 shares authorized; 4,596,439 shares issued and outstanding at December 31, 2012 and 2011, respectively	459,644	459,644
Accumulated other comprehensive income	178,979	34,612
Retained earnings	12,199,395	13,619,773
Total stockholders’ equity	12,838,018	14,114,029
Total liabilities and stockholders’ equity	$ 13,859,266	$ 15,255,955