Note 11 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

			Quoted
			Prices in
			Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
			Assets		Inputs		Inputs
Assets	Total		(Level 1)		(Level 2)		(Level 3)
Money market mutual funds	$	27,745	$	27,745	$	—	$	—

			Quoted
			Prices in
			Active		Significant
			Markets for		Other		Significant
			Identical		Observable		Unobservable
			Assets		Inputs		Inputs
Assets	Total		(Level 1)		(Level 2)		(Level 3)
Money market mutual funds	$	27,644	$	27,644	$	—	$	—