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Note 4 - Fair Value Measurements (Tables)
3 Months Ended
Apr. 30, 2021
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 April 30, 2021

            

Money market mutual funds

 $117,109         

Certificates of deposit

 $11,838         

Liability related to the interest rate swap

     $(261

)

    

Contingent liability associated with acquisitions

         $(5,417)
             

As of January 31, 2021

            

Money market mutual funds

 $80,611         

Certificates of deposit

 $9,262         

Liability related to the interest rate swap

     $(325

)

    

Contingent liability associated with acquisitions

         $(4,751)
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
 

Liability

 
   

Fair Value

 
 

Balance Sheet
Location

 

April 30,
2021

  

January 31,
2021

 

Derivative instrument:

         

Interest rate swap

Other liabilities

 $(261

)

 $(325

)

Total

 $(261

)

 $(325

)