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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 03, 2018
Jan. 28, 2017
May 05, 2018
Apr. 29, 2017
May 05, 2018
Aug. 31, 2017
Stock Repurchased and Retired During Period, Value $ 4,597 $ 732    
The August 2017 Share Repurchase Program [Member]            
Stock Repurchase Program, Authorized Amount           $ 20,000
Stock Repurchased and Retired During Period, Shares         1.1  
Share Price     $ 8.86   $ 8.86  
Stock Repurchased and Retired During Period, Value         $ 10,000