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Note N - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards, Valuation Allowance   $ 0 $ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   34.00% 34.00%
Deferred Tax Assets Gross, Increase (Decrease) Due to New Tax Cuts and Jobs Act 2017   $ (8,677,000)  
Percentage of Valuation Allowance   100.00%  
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount   $ 18,339 $ 13,000
Unrecognized Tax Benefits   0 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense   0 0
Deferred Tax Assets Related to New Tax Cuts and Jobs Act 2017 [Member]      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ (8,677,000)  
Earliest Tax Year [Member]      
Open Tax Year   2014  
Latest Tax Year [Member]      
Open Tax Year   2016  
Domestic Tax Authority [Member]      
Operating Loss Carryforwards   $ 60,000,000 56,530,000
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards   $ 24,500,000 $ 22,942,000
Scenario, Forecast [Member]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%