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Note 14 - Income Taxes - Deferred Income Taxes (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Amortization of intangibles $ 267,253 $ 272,734
Bad debt allowance 66,662 42,963
Patent litigation liability accrual 128,804 164,342
Operating loss carryforwards 19,034,573 20,175,531
Gross deferred tax assets 19,497,292 20,655,570
Valuation allowance (19,497,292) (20,655,570)
Net deferred tax liability/(asset) $ 0 $ 0