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Note 10 - Stock-based Compensation (Details Textual)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2019
shares
Jul. 31, 2018
USD ($)
Jan. 31, 2020
USD ($)
shares
Jan. 31, 2019
USD ($)
shares
Jan. 31, 2018
shares
Number of Incentive Stock Plans Under Which New Awards May Be Granted     1    
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares     613,904    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) | shares     0 0  
Proceeds from Stock Options Exercised | $     $ 0.4 $ 0.5  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $     $ 0.1 $ 0.1  
Percentage of Options Expected to Vest     94.00%    
Director [Member]          
Deferred Stock Compensation Arrangements, Classified from a Liability to Additional Paid In Capital | $   $ 0.7      
Share-based Payment Arrangement, Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)     10 years    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $     $ 0.1    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     146 days    
Deferred Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares 23,104        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) | shares     125,049    
Restricted Stock [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $     $ 1.5    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 36 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares     152,000 148,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) | shares     358,000 283,000 360,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $     $ 0.8 $ 1.1  
Restricted Stock [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     3 years    
Restricted Stock [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     4 years