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Note 8 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 01, 2016
Deferred Tax Assets, Tax Credit Carryforwards   $ 757,000 $ 642,000  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00% 35.00%  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability   $ 805,000    
Deferred Tax Assets, Gross   1,964,000 $ 2,935,000  
Deferred Tax Assets, Valuation Allowance   1,964,000 2,935,000 $ 2,900,000
Operating Loss Carryforwards   3,783,000 4,116,000  
Unrecognized Tax Benefits   0 0  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   0 0  
Liability for Uncertainty in Income Taxes, Current   0 0  
Unrecognized Tax Benefits, Interest on Income Taxes Expense   0 $ 0  
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%      
Prior To Their Acquisition By The Company [Member]        
Operating Loss Carryforwards   $ 1,500,000