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Note 3 - Income (Loss) Per Share - Antidilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Total anti-dilutive securities (in shares) 6,362,156 6,148,653
Restricted Stock Units (RSUs) [Member]    
Total anti-dilutive securities (in shares) 4,223,156 3,111,320
Share-Based Payment Arrangement, Option [Member]    
Total anti-dilutive securities (in shares) 2,139,000 2,204,000
Warrant [Member]    
Total anti-dilutive securities (in shares) 0 833,333