Note 5 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Net Deferred Tax Assets Liabilities	$ 9,200		$ 10,700
Deferred Tax Assets, Operating Loss Carryforwards, Total	5,700
Operating Loss Carryforwards, Total	30,000
Deferred Tax Assets, Valuation Allowance, Total	$ 0		$ 0