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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 34.00%          
Tax Adjustments, Settlements, and Unusual Provisions       $ (43)    
Taxes Payable, Total   $ 322   322    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability       $ (279)    
Effective Income Tax Rate Reconciliation, Percent, Total   9.50% (5.30%) 8.60% (18.00%)  
Scenario, Forecast [Member]            
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent           21.00%