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Note 8 - Capital Stock and Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
May 04, 2021
Jun. 30, 2021
Jun. 30, 2020
Treasury Stock, Shares, Retired (in shares) 7,745,507    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 7  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   2 years 2 months 12 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)   $ 4.61  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)   4,389,966 5,727,716