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Note 7 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Federal statutory rate (21.00%) (34.00%)
State income taxes, net of Federal benefits (5.00%) (4.10%)
Rate changes (66.30%) 155.00%
Change in fair value of liability classified warrants (17.30%) (3.60%)
Other, including non-deductible expenses 53.90% 9.60%
Valuation allowance 55.70% (122.90%)
Total 0.00% 0.00%