Note 4 - Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

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]

	Year Ended December 31, 2017
Balance at beginning of period	$	-
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 at end of period	$	5,744