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Note 8 - Earnings Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Restricted Stock Units (RSUs) [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   341,545 323,377
Prefunded Warrants [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   3,930,000 3,930,000
Warrant [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   560,000 560,000
Share-Based Payment Arrangement, Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0 0