Note 4 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

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

	Amounts at		Fair Value Measurement Using
	Fair Value		Level 1		Level 2		Level 3
As of December 31, 2017
Contingent consideration liability	$	5,744	$	-	$	-	$	5,744

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

Balance – January 1, 2017	$	-
Contingent consideration liability established in connection with the acquisition of Ambrell		4,123
Fair value adjustment		6,976
Transfer of contingent consideration liability to 2017 earnout payable		(5,355	)
Balance – December 31, 2017		5,744
Fair value adjustment		6,901
Transfer of contingent consideration liability to 2018 earnout payable		(12,645	)
Balance – December 31, 2018	$	-