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Note 2 - (Loss) Income Per Share - Antidilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total anti-dilutive securities (in shares) 6,080,206 8,183,592
Restricted Stock Units (RSUs) [Member]    
Total anti-dilutive securities (in shares) 3,042,873 3,216,816
Share-based Payment Arrangement, Option [Member]    
Total anti-dilutive securities (in shares) 2,204,000 2,568,000
Warrant [Member]    
Total anti-dilutive securities (in shares) 833,333 2,398,776