Note 14 - Income Taxes - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Expected tax at U.S. statutory income tax rate	21.00%	35.00%
U.S. state and local income taxes net of federal income tax effect	0.04%	1.40%
Foreign rate differential	(3.00%)	11.20%
Foreign unremitted earnings	12.40%	(11.80%)
Foreign tax credit	0.00%	(31.80%)
Change in valuation allowance	(30.60%)	49.40%
Withholding tax	6.40%	(14.20%)
Intra-period allocation	0.00%	(8.20%)
Nondeductible Expenses	0.00%	(51.20%)
Other	0.20%	0.00%
Effective tax rate	6.40%	(3.80%)