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13. Income Taxes (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 28, 2018
Apr. 29, 2018
Oct. 29, 2017
Oct. 28, 2018
Oct. 29, 2017
Jan. 28, 2018
13. Income Taxes (Details) [Line Items]            
Income Tax Expense (Benefit) $ 2,775,000   $ 4,006,000 $ 7,504,000 $ 10,574,000  
Effective Income Tax Rate Reconciliation, Percent 22.90%   35.70% 23.00% 34.90%  
Reclassification from AOCI, Current Period, Tax $ 0 $ 111,000 $ 0 $ 111,000 $ 0  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 82,000     82,000   $ 80,000
Prior Period Adjustments for Adoption of ASU 2017-09 [Member]            
13. Income Taxes (Details) [Line Items]            
Prior Period Reclassification Adjustment       $ 120,000