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Note 2 - Earnings Per Common Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-Based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 543,500 132,000 533,400 132,000
Unvested Performance Unit Awards [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 148,520 106,582 148,520 106,582