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Note 3 - Loss (Income) Per Share - Antidilutive Securities Excluded from Calculation of Diluted Income (Loss) Per Share (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Total anti-dilutive securities (in shares) 7,913,146 6,442,741
Restricted Stock Units (RSUs) [Member]    
Total anti-dilutive securities (in shares) 3,394,370 3,831,965
Share-based Payment Arrangement, Option [Member]    
Total anti-dilutive securities (in shares) 2,120,000 112,000
Warrant [Member]    
Total anti-dilutive securities (in shares) 2,398,776 2,498,776