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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total anti-dilutive securities (in shares) 5,880,903 8,163,723 5,880,903 7,039,906
Restricted Stock Units (RSUs) [Member]        
Total anti-dilutive securities (in shares) 2,843,570 3,412,390 2,843,570 2,288,573
Share-based Payment Arrangement, Option [Member]        
Total anti-dilutive securities (in shares) 2,204,000 2,568,000 2,204,000 2,568,000
Warrant [Member]        
Total anti-dilutive securities (in shares) 833,333 2,183,333 833,333 2,183,333