Balance Sheets (Current Period Unaudited) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 1,935,750	$ 1,748,382
Marketable securities	8,698,103	7,743,946
Accounts receivable, net of allowance for doubtful accounts of $29,000 at September 30, 2013 and December 31, 2012	2,376,054	1,017,627
Receivable in connection with damage settlement	97,610	518,050
Inventories (net)	1,121,591	1,242,750
Prepaid expenses and other current assets	99,784	132,458
Prepaid income taxes	0	3,602
Deferred income taxes	216,588	216,588
Total current assets	14,545,480	12,623,403
Property, plant and equipment:
Land	69,000	69,000
Factory equipment and fixtures	4,056,719	3,842,927
Building and improvements	2,747,263	2,725,993
Waste disposal plant	133,532	133,532
Total property, plant and equipment	7,006,514	6,771,452
Less: Accumulated depreciation	5,676,501	5,535,589
Total property, plant and equipment, net	1,330,013	1,235,863
Other assets	4,438	0
TOTAL ASSETS	15,879,931	13,859,266
Accounts payable	136,095	151,385
Accrued expenses	704,436	676,123
Income taxes payable	99,624	0
Total current liabilities	940,155	827,508
Deferred income taxes	153,724	193,740
Commitment (Note 13)
Stockholders’ equity:
Common stock $.10 par value, authorized, 10,000,000 shares; 4,596,439 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively.	459,644	459,644
Accumulated other comprehensive income	103,358	178,979
Retained earnings	14,223,050	12,199,395
Total stockholders’ equity	14,786,052	12,838,018
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 15,879,931	$ 13,859,266