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Note 5 - Computation of Net Income Per Share of Common Stock (Details Textual) - shares
3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 496,105 475,971 508,391 471,985
Performance Shares [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 495,834 475,971 507,895 471,768
Share-Based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 271   496 217