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Note 2 - Income (Loss) Per Share - Antidilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Total anti-dilutive securities (in shares) 3,359,790 5,852,121 3,919,022 5,852,121
Restricted Stock Units (RSUs) [Member]        
Total anti-dilutive securities (in shares) 1,220,790 2,814,788 1,780,022 2,814,788
Share-Based Payment Arrangement, Option [Member]        
Total anti-dilutive securities (in shares) 2,139,000 2,204,000 2,139,000 2,204,000
Warrant [Member]        
Total anti-dilutive securities (in shares) 0 833,333 0 833,333