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Note 3 - Income Tax (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       35.00%
Tax Adjustments, Settlements, and Unusual Provisions $ 19,794 $ 0    
Scenario, Forecast [Member]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%