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Note 10 - Income Tax (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Feb. 21, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets, Gross, Total   $ 2,881 $ 1,936  
Deferred Tax Assets, Valuation Allowance, Total   $ 136  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00% 21.00% 34.00%
Open Tax Year   2016 2017 2018 2019    
Unrecognized Tax Benefits, Ending Balance   $ 0 $ 150 $ 150
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total   0 $ 153  
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities $ 156,000      
One State Jurisdiction [Member]        
Tax Credit Carryforward, Amount   $ 348