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Note 10 - Income Taxes (Details Textual) - USD ($)
12 Months Ended
Jan. 17, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2019
Deferred Tax Assets, Net of Valuation Allowance, Total   $ 1,900,000      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00% 34.00% 34.00%  
Unrecognized Tax Benefits, Ending Balance   $ 150,000 $ 150,000 $ 150,000  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total   153,000 153,000    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ (1,500,000)    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ (50,000)      
Scenario, Forecast [Member]          
Unrecognized Tax Benefits, Ending Balance         $ 0
Subsequent Event [Member]          
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities $ 156,000        
Domestic Tax Authority [Member]          
Open Tax Year   2015 2016 2017 2018      
State and Local Jurisdiction [Member]          
Open Tax Year   2015 2016 2017 2018      
One State Jurisdiction [Member]          
Tax Credit Carryforward, Amount   $ 325,000