Note 4 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

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

			Active Markets		Significant Other		Significant
	June 30, 2021		for Identical Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Amortized Cost
Cash equivalents:
Money Market Funds	$	67,038	$	67,038	$	-	$	-	$	67,038
Other current and long-term liabilities:
Contingent Consideration - Short Term	$	16,870	$	-	$	-	$	16,870	$	-
Contingent Consideration - Long Term		70		-		-		70		-
Total other current and long-term liabilities	$	16,940	$	-	$	-	$	16,940	$	-

			Active Markets		Significant Other		Significant
	December 31, 2020		for Identical Assets (Level 1)		Observable Inputs (Level 2)		Unobservable Inputs (Level 3)		Amortized Cost
Cash equivalents:
Money Market Funds	$	74,522	$	74,522	$	-	$	-	$	74,522
Investments:
U.S. Treasury Bills	$	2,501	$	2,501	$	-	$	-	$	2,524
Other current and long-term liabilities:
Contingent Consideration - Short Term	$	13,090	$	-	$	-	$	13,090	$	-
Contingent Consideration - Long Term		22,320		-		-		22,320		-
Total other current and long-term liabilities	$	35,410	$	-	$	-	$	35,410	$	-

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

	Three Months Ended June 30, 2021			Six Months Ended June 30, 2021
Balance, beginning	$	30,590		$	35,410
Additions		-			-
Payments		-			-
Change in fair value		(13,650	)		(18,470	)
Balance, ending	$	16,940		$	16,940