Note 16 - Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statutory Rate	21.00%	21.00%	34.00%
State Tax	3.10%	(0.30%)	0.20%
Stock Based Compensation Expense	(3.70%)	(4.30%)	(2.10%)
Change in Valuation Allowance	(23.00%)	(13.00%)	141.70%
Other	(0.30%)	(0.50%)	0.70%
Warrant/equity expenses	1.70%	4.20%	(0.50%)
Impact of 162m	1.10%	1.30%	(4.60%)
Tax Reform - Tax Rate Change	0.00%	0.00%	(169.50%)
Impact of ASC 606	0.00%	(8.50%)	0.00%
Total	(0.10%)	(0.10%)	(0.10%)