Note 5 - Taxes (Details Textual) - USD ($)	9 Months Ended		12 Months Ended		36 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2010	Dec. 31, 2006
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	34.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ 201,000	$ 363,000
VAT and Withholding Taxes					$ 800,000
Interest Penalty Percentage					20.00%
Reserve for Tax Deficiencies of Subsidiaries [Member]
Loss Contingency Accrual	$ 171,000		$ 158,000
Selling, General and Administrative Expenses [Member] | Reserve for Tax Deficiencies of Subsidiaries [Member]
Loss Contingency Accrual, Period Increase (Decrease)				$ 185,000
Operating Loss Carryforwards [Member]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount			$ 292,000