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Note N - Income Taxes - Deferred Tax Assets (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts-short term $ 3,000 $ 4,000
Warranty reserve 20,000 36,000
Capital Gains 45,000
Deferred officers compensation 636,000 395,000
Depreciation and Amortization 181,000 135,000
Deferred revenue 478,000
Net operating loss carryforward 15,116,000 18,456,000
Subtotal 16,479,000 19,026,000
Valuation allowance $ (16,479,000) $ (19,026,000)