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Note 2 - Income Per Share - Antidilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Total anti-dilutive securities (in shares) 8,163,723 3,520,000 7,039,906 5,150,502
Restricted Stock Units (RSUs) [Member]        
Total anti-dilutive securities (in shares) 3,412,390 110,000 2,288,573 1,740,502
Share-based Payment Arrangement, Option [Member]        
Total anti-dilutive securities (in shares) 2,568,000 2,060,000 2,568,000 2,060,000
Warrant [Member]        
Total anti-dilutive securities (in shares) 2,183,333 1,350,000 2,183,333 1,350,000