Note 12 - FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

The following table represents the Company’s assets measured at fair value on a recurring basis as of June 30, 2021, and December 31, 2020, and the basis for those measurements (in thousands):

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other
			Identical		Observable		Significant
	June 30,		Assets		Inputs		Unobservable
Assets	2021		(Level 1)		(Level 2)		Inputs (Level 3)
Cash equivalents
Money market mutual funds	$	69,028	$	69,028	$	—	$	—
Short-term investments (available-for-sale debt securities)
U.S. Treasury bills		51,993		51,993		—		—
Total	$	121,021	$	121,021	$	—	$	—

	Fair Value Measurements Using
			Quoted
			Prices in
			Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
	December 31,		Assets		Inputs		Inputs
Assets	2020		(Level 1)		(Level 2)		(Level 3)
Cash equivalents
Money market mutual funds	$	18,012	$	18,012	$	—	$	—
Short-term investments (available-for-sale debt securities)
U.S. Treasury bills		114,981		114,981		—		—
Total	$	132,993	$	132,993	$	—	$	—