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Note 10 - Earnings (Loss) Per Share - Common Stock ("EPS") - Securities Excluded From the Diluted Per Share Calculation (Details) - Exercise Price Greater Than Average Market Price Of Common Shares [Member] - shares
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Antidilutive securities (in shares) 5,044,759 4,901,848 5,044,759 4,901,848
Share-Based Payment Arrangement, Option [Member]        
Antidilutive securities (in shares) 172,734 212,461 172,734 212,461
Warrant [Member]        
Antidilutive securities (in shares) 4,872,025 4,689,387 4,872,025 4,689,387