Note 14 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%
Deferred Tax Assets, GILTI		$ 0
Income Tax Expense (Benefit), Total	$ (392,000)	188,000
Excess Tax Benefit (Deficiency) on Vested Awards		0
Deferred Tax Liabilities, Undistributed Foreign Earnings Cumulative Translation Adjustment	0	404,000
Income Tax Expense (Benefit), Intraperiod Tax Allocation, Total		(404,000)
Deferred Tax Assets, Valuation Allowance, Total	10,263,000	8,647,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0	0
Unrecognized Tax Benefits, Ending Balance	0	$ 0
Amount of Unrecognized Tax Benefits, Expected	$ 0
Effective Income Tax Rate Reconciliation, Tax Holiday, Percent	4.90%	4.90%
Deferred Tax Liabilities, GILTI		$ 0
Foreign Tax Authority [Member]
Open Tax Year	2012 2013 2014 2015 2016 2017
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2015 2017
Operating Loss Carryforwards, Increase (Decrease) from Tax Audit	$ 44,000
State and Local Jurisdiction [Member]
Open Tax Year		2012 2013 2014 2015 2016 2017
Accounting Standards Update 2016-09 [Member]
Income Tax Expense (Benefit), Total		$ 0