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Note 10 - Earnings (Loss) Per Common Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 354,965 400,020 354,965 225,569