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Note 2 - Loss Per Share - Antidilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Total anti-dilutive securities (in shares) 4,014,000 5,880,903 4,014,000 5,880,903
Restricted Stock Units (RSUs) [Member]        
Total anti-dilutive securities (in shares) 1,875,000 2,843,570 1,875,000 2,843,570
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