Note 13 - Income Taxes - Reconciliation of Income Tax (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Tax benefit at U.S. Federal statutory tax rate	34.00%	34.00%
Stock compensation expense	12.10%
Taxes in respect of prior years	9.10%	0.20%
Increase in valuation allowance	8.30%	28.00%
Nondeductible meals & entertainment expense and other	4.40%	7.20%
State taxes, net of federal benefit	0.30%
Foreign rate differential	(0.20%)	(1.50%)
Foreign R&D credit	(1.70%)
Effective tax rate	(1.70%)	(0.10%)