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Note 14 - Income Taxes - Deferred Income Taxes (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Amortization of intangibles $ 253,466 $ 261,771
Bad debt allowance 68,133 55,436
Patent litigation liability accrual 359,377 169,709
Impact of the Tax Cuts and Jobs Act 0 (1,699,440)
Operating loss carryforwards 15,585,125 17,973,631
Gross deferred tax assets 16,266,101 16,761,107
Valuation allowance (16,266,101) (16,761,107)
Net deferred tax liability/(asset) $ 0 $ 0