Note L - Income Taxes - Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts-short term	$ 4,000	$ 2,000
Warranty reserve	36,000	43,000
Deferred officers compensation	395,000	643,000
Subtotal	435,000	688,000
Valuation allowance	(435,000)	(688,000)
Depreciation and amortization	135,000	149,000
Net operating loss carryforward	18,456,000	16,160,000
Federal tax effect of state deferred tax assets		(117,000)
Subtotal	18,591,000	16,192,000
Valuation allowance	$ (18,591,000)	$ (16,192,000)