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Note 2 - Earnings Per Common Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Share-Based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 522,300 157,000 518,200 157,000
Unvested Performance Unit Awards [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 141,320 106,582 141,320 106,582