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Note 14 - Earnings Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Share-based Payment Arrangement, Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0    
Performance Shares [Member]      
Share-based Compensation Awards Excluded from Computation of Earnings Per Share Amount (in shares)   79,390 68,933