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Note 11 - Federal and State Income Taxes (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     34.00% 34.00% 34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 29,300,000        
Income Taxes Receivable 1,214,000   $ 1,214,000    
Deferred Tax Assets, Tax Credit Carryforwards, General Business 988,000   988,000    
Operating Loss Carryforwards 30,983,000   30,983,000    
Deferred Tax Assets, Valuation Allowance 0   0 $ 0  
Income Tax Examination, Penalties and Interest Expense     $ 0 0  
Statute of Limitations     3 years    
Receivables, Long-term Contracts or Programs $ 29,000   $ 29,000 $ 167,000  
Scenario, Forecast [Member]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   21.00%