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Note 5 - Share-based Compensation - Outstanding Performance Shares (Details) - Performance Shares [Member] - shares
May 05, 2018
Feb. 03, 2018
Dec. 30, 2017
Performance shares (in shares) 315,268 289,615 289,615
Vesting Subject to Time-based Restrictions [Member]      
Performance shares (in shares) 6,325  
Vesting Upon Achievement of 2015-2017 Consolidated Revenues Target [Member]      
Performance shares (in shares) 50,000  
Vesting Upon Achievement of 2016-2018 Consolidated Revenues Target [Member]      
Performance shares (in shares) 148,115 149,393  
Vesting Upon Achievement of 2017-2019 Consolidated Pre-tax Income Target [Member]      
Performance shares (in shares) 83,897 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