Annual report pursuant to Section 13 and 15(d)

Note 12 - Stock-Based Compensation (Details Textual)

v3.24.0.1
Note 12 - Stock-Based Compensation (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Restricted Stock [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 3 years  
Share-Based Payment Arrangement, Expense $ 820,000 $ 703,000
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 1,300,000  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 6 months 29 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 877,000,000 $ 732,000,000
Restricted Stock [Member] | Share-Based Payment Arrangement, Tranche One [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 0.33%  
Stock Incentive Plan of 2015 [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 1,500,000  
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 895,698