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Note 6 - Stock-based Compensation - Outstanding Performance Shares (Details) - Performance Shares [Member] - shares
May 02, 2020
Feb. 01, 2020
Performance shares (in shares) 179,067 262,964
Vesting Upon Achievement of 2018-2020 Consolidated Total Revenues Growth Objectives [Member]    
Performance shares (in shares) 20,756  
Vesting Upon Achievement of 2017-2019 Consolidated Pre-tax Income Target [Member]    
Performance shares (in shares) 62,500  
Vesting Upon Achievement of 2018-2020 Consolidated Pre-tax Income Growth Objectives [Member]    
Performance shares (in shares) 95,811