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Note 9 - Earnings Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares
shares in Thousands
6 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Stock awards excluded from diluted EPS (in shares) 11 501 32 501
Stock Awards that were Antidilutive [Member]        
Stock awards excluded from diluted EPS (in shares) 1 501 23 501
Stock Awards Subject to Performance Conditions [Member]        
Stock awards excluded from diluted EPS (in shares) 10 9