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Note 1 - Summary of Business and Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Feb. 01, 2019
Foreign Currency Transaction Gain (Loss), before Tax, Total $ 100 $ (200) $ 2,500  
Depreciation, Depletion and Amortization, Total 5,100 $ 4,700 4,600  
Capitalized Software Amortization Period (Year)   3 years    
Write-off of Fully Amortized Software Development Costs 200      
Capitalized Computer Software, Amortization $ 900 $ 600 800  
Finite-Lived Intangible Asset, Useful Life (Year) 5 years      
Amortization of Intangible Assets, Total $ 268 111 416  
Impairment of Long-Lived Assets Held-for-use 0 0 0  
Advertising Expense 600 700 700  
Research and Development Expense, Total 54,726 $ 53,993 $ 47,661  
Class Common Stock to Class B Common Stock Cash or Stock Dividends Payout Ratio   120.00%    
Operating Lease, Right-of-Use Asset $ 18,154      
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset       $ 13,100
Operating Lease, Liability, Total       $ 13,900
Minimum [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Vesting Rights, Percentage 0.00%      
Maximum [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Vesting Rights, Percentage 200.00%      
Computer Equipment and Software [Member]        
Property, Plant and Equipment, Useful Life (Year)   3 years    
Furniture and Office Equipment [Member]        
Property, Plant and Equipment, Useful Life (Year)   5 years    
Building Improvements [Member]        
Property, Plant and Equipment, Useful Life (Year)   10 years    
Building [Member]        
Property, Plant and Equipment, Useful Life (Year)   39 years    
Leasehold Improvements [Member]        
Property, Plant and Equipment, Useful Life (Year)   5 years    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Concentration Risk, Percentage 10.00% 10.00%    
Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Concentration Risk, Percentage   0.00% 0.00%  
Other Current Assets [Member] | Building Held for Sale [Member]        
Assets Held-for-sale, Not Part of Disposal Group, Total $ 1,600