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Note 2 - Income Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Restricted Stock [Member]        
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares) 237,000 257,000 252,000 194,000
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) 10,000 0 11,000 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 33,000 0 33,000 0