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Note 11 - Federal and State Income Taxes (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Examination, Penalties and Interest Expense $ 0 $ 0
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 1,378,000 1,206,000
Deferred Tax Assets, Tax Credit Carryforwards, General Business 988,000  
Operating Loss Carryforwards $ 8,584,000  
Statute of Limitations 3 years  
Receivables, Long-term Contracts or Programs $ 484,000 $ 8,496,000