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Note 6 - Fair Value Measurements (Tables)
 12 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  Total Carrying Value  Quoted Prices in Active Markets (Level 1)  Significant Other Observable Inputs (Level 2)  Significant Unobservable Inputs (Level 3) 

March 31, 2022:

                

Assets:

                

Cash equivalents

 $17,641  $17,641  $—  $— 

Marketable securities

 $—  $—  $—  $— 

Derivative liabilities:

                

Contingent Consideration

 $1,200  $—  $—  $1,200 
  Total Carrying Value  

Quoted Prices in Active Markets (Level 1)

  Significant Other Observable Inputs (Level 2)  Significant Unobservable Inputs (Level 3) 

March 31, 2021:

                

Assets:

                

Cash equivalents

 $54,104  $54,104  $—  $— 

Marketable securities

 $5,140  $5,140  $—  $— 

Derivative liabilities:

                

Contingent Consideration

 $7,050  $—  $—  $7,050 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

Acquisition Contingent Consideration

 

Balance at April 1, 2020

 $- 

Issuance of contingent consideration

  3,990 

Change in fair value

  3,060 

Balance at March 31, 2021

 $7,050 

Change in fair value

  (5,850)

Balance at March 31, 2022

 $1,200