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Note 12 - Earnings Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Awards Excluded from Computation of Earnings Per Share Amount     51,270  
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 0 0
Performance Shares [Member]        
Share-based Compensation Awards Excluded from Computation of Earnings Per Share Amount       29,607