Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 8,000		$ 8,007
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	34.00%
Operating Loss Carryforwards, Total		$ 30,000
Deferred Tax Assets, Valuation Allowance, Total	$ 0	$ 0	$ 0