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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Total anti-dilutive securities (in shares) 7,707,341 4,014,000 7,731,510 4,014,000
Restricted Stock Units (RSUs) [Member]        
Total anti-dilutive securities (in shares) 5,568,341 1,875,000 5,592,510 1,875,000
Share-Based Payment Arrangement, Option [Member]        
Total anti-dilutive securities (in shares) 2,139,000 2,139,000 2,139,000 2,139,000