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Note 8 - Capital Stock and Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 7.4     $ 7.4  
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)       1 year 10 months 24 days  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)   $ 5.92      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0.9   4.8 3.7 4.7