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Note 5 - Share-based Compensation - Outstanding Performance Shares (Details) - Performance Shares [Member] - shares
Nov. 03, 2018
Feb. 03, 2018
Performance shares (in shares) 315,268 289,615
Vesting Upon Achievement of 2016-2018 Consolidated Revenues Target [Member]    
Performance shares (in shares) 148,115  
Vesting Upon Achievement of 2017-2019 Consolidated Pre-tax Income Target [Member]    
Performance shares (in shares) 83,897  
Vesting Upon Achievement of 2018-2020 Consolidated Total Revenues Growth Objectives [Member]    
Performance shares (in shares) 20,756  
Vesting Upon Achievement of 2018-2020 Consolidated Pre-tax Income Growth Objectives [Member]    
Performance shares (in shares) 62,500