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Note 4 - Fair Value Measurements (Tables)
9 Months Ended
Oct. 31, 2020
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   

Fair value measurement at reporting date using

   

Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)

   

Significant
Other
Observable
Inputs
(Level 2)

 

Significant
Unobservable
Inputs
(Level 3)

   

(in thousands)

As of October 31, 2020

                 

Money market mutual funds

  $ 116,963            

Certificates of deposit

  $ 8,060            

Liability related to the interest rate swap

          $ (381 )  
                   

As of January 31, 2020

                 

Money market mutual funds

  $ 107,319            

Certificates of deposit

  $ 14,917            

Liability related to the interest rate swap

          $ (232

)

 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
 

Liability

 
     

Fair Value

 
 

Balance Sheet
Location

 

October 31,
2020

   

January 31,
2020

 

Derivative instrument:

                 

Interest rate swap

Other liabilities

  $ (381

)

  $ (232

)

Total

  $ (381

)

  $ (232

)