Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Income Taxes (Details Textual)

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Note 7 - Income Taxes (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Effective Income Tax Rate Reconciliation, Percent, Total 23.50% 25.10% 24.10% 25.00%  
Forecast [Member]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent         21.00%