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Note 8 - Earnings Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Restricted Stock Units (RSUs) [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)     314,462 313,043
Prefunded Warrants [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)     3,930,008 3,930,008
Warrant [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)     1,091,346 560,096
Share-Based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0 0 0 0