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Note 5 - Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]
  

March 31, 2023 (Unaudited)

 
  

Amortized
cost

  

Gross
unrealized
gains

  

Gross
unrealized
losses

  

Fair
value

 

Available-for-sale - matures within one year:

                

Corporate bonds

 $23,397  $  $(1,517) $21,880 
                 

Available-for-sale - matures after one year through four years:

                

Corporate bonds

  88,934   25   (4,697)  84,262 

Total

                
  $112,331  $25  $(6,214) $106,142 
  

December 31, 2022

 
  

Amortized
cost

  

Gross
unrealized
gains

  

Gross
unrealized
losses

  

Fair
value

 

Available-for-sale - matures within one year:

                

Corporate bonds

 $17,552  $  $(1,330) $16,222 
                 

Available-for-sale - matures after one year through five years:

                

Corporate bonds

  101,355   38   (5,535)  95,858 
                 

Total

 $118,907  $38  $(6,865) $112,080 
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
  

Less than 12 months

  

12 months or greater

 
  

Fair value

  

Gross unrealized loss

  

Fair value

  

Gross unrealized loss

 

As of March 31, 2023 (unaudited)

 $36,115  $(877) $64,211  $(5,337)

As of December 31, 2022

 $58,706  $(1,885) $48,539  $(4,980)
Schedule of Realized Gain (Loss) [Table Text Block]
  

Three months ended
March 31,

 
  

2023

(unaudited)

  

2022

(unaudited)

 
         

Gross realized gains from sale of available-for-sale marketable securities

 $92  $ 

Gross realized losses from sale of available-for-sale marketable securities

 $  $