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Note 5 - Stock-Based Compensation - Weighted Average Period for Recognition of Unrecognized Compensation Cost for Stock Options and Restricted Stock (Details)
3 Months Ended
Mar. 31, 2024
Restricted Stock [Member]  
Weighted average period (in years) (Year) 8 months 4 days
Restricted Stock Units (RSUs) [Member]  
Weighted average period (in years) (Year) 1 year 6 months 21 days
Performance Shares [Member]  
Weighted average period (in years) (Year) 2 years