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Note 10 - Earnings Per Share - Anti-dilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Anti-dilutive securities (in shares) 599,500 557,052 599,500 560,000
Share-Based Payment Arrangement, Option [Member]        
Anti-dilutive securities (in shares) 599,500 557,052 599,500 560,000