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Note 2 - Income Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Restricted Stock [Member]        
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares) 254,000 305,000 247,000 271,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0 0 0 0
Share-Based Payment Arrangement, Option [Member]        
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares) 478,000 182,000 411,000 109,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0 0 32,000 0