Note 4 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

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

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets		Significant Other		Significant
			for Identical Assets		Observable Inputs		Unobservable Inputs
	June 30, 2020		(Level 1)		(Level 2)		(Level 3)		Amortized Cost
Cash equivalents:
Money market funds	$	49,357	$	49,357	$	-	$	-	$	49,357
Investments:
Bank certificates of deposit	$	7,514	$	-	$	7,514	$	-	$	7,524
U.S. treasury bills		20,110		20,110		-		-		20,178
Total investments	$	27,624	$	20,110	$	7,514	$	-	$	27,702
Other current and long-term liabilities:
Contingent consideration- short term	$	11,688	$	-	$	-	$	11,688	$	-
Contingent consideration- long term		37,062		-		-		37,062		-
Total other current and long-term liabilities	$	48,750	$	-	$	-	$	48,750	$	-

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets		Significant Other		Significant
			for Identical Assets		Observable Inputs		Unobservable Inputs
	December 31, 2019		(Level 1)		(Level 2)		(Level 3)		Amortized Cost
Cash equivalents:
Money Market Funds	$	48,971	$	48,971	$	-	$	-	$	48,971
Investments:
U.S. Treasury Bills	$	27,480	$	27,480	$	-	$	-	$	27,479

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

	Six Months Ended
	June 30, 2020
Balance, beginning January 1, 2020	$	-
Additions		69,076
Payments		-
Change in fair value		(20,326	)
Balance, ending June 30, 2020	$	48,750