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Note 13 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 22, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 21.00%    
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 100,000 $ (82,900,000)  
Deferred Tax Assets, Valuation Allowance, Total   50,000 50,000  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate   2,400,000 2,600,000  
Unrecognized Tax Benefits, Interest on Income Taxes Expense   (27,450) 21,050 $ 34,800
Unrecognized Tax Benefits, Income Tax Penalties Accrued   0 0 0
Unrecognized Tax Benefits, Interest on Income Taxes Accrued   139,000 $ 166,000 $ 145,000
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards, Total   $ 51,000,000    
Open Tax Year   2015 2016 2017 2018    
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to Operating Loss Carryforwards [Member]        
Deferred Tax Assets, Valuation Allowance, Total   $ 50,000    
Domestic Tax Authority [Member]        
Open Tax Year   2016 2017 2018