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Note 11 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   34.00% 34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 2,500  
Deferred Tax Assets, Federal and State, Net Operating Losses Carryforward   2,100 $ 3,600
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration   3,500 5,200
Unrecognized Tax Benefits   0 $ 0
Unrecognized Tax Benefits, Period Increase (Decrease)   0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   $ 0  
Earliest Tax Year [Member]      
Open Tax Year   2013  
Latest Tax Year [Member]      
Open Tax Year   2017  
Scenario, Forecast [Member]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%