Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Income Taxes (Details Textual)

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Note 3 - Income Taxes (Details Textual)
 3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Effective Income Tax Rate Reconciliation, Percent 35.10% 36.50%
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Earliest Tax Year [Member]    
Income Tax Examination, Year under Examination 2012  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member] | Latest Tax Year [Member]    
Income Tax Examination, Year under Examination 2014