Note 11 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Expected federal income tax benefit	$ (2,395,036)	$ (2,761,678)
Stock compensation	169,957	197,336
Other permanent items	1,616	2,668
Effect of change in valuation allowance	2,223,463	(15,344,015)
Prior year true-up		(126,031)
Tax rate change		1,912,427
Effect of NOL limitation		16,119,293
Actual federal income tax benefit	$ 0	$ 0

It represents value of effects of net operating loss limitations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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