Note 14 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	34.00%
Deferred Tax Assets, Net, Total	$ 0	$ 0
Deferred Tax Assets, Valuation Allowance, Total	12,447	12,333
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	100	$ 2,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 37,200
Open Tax Year	2016 2017 2018 2019
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 32,300
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 15,500