Note 3 - Acquisition - Purchase Price (Details) - USD ($) $ in Thousands	May 24, 2017	Jun. 30, 2017	Dec. 31, 2016
Goodwill		$ 18,526	$ 1,706
Ambrell [Member]
Cash paid to acquire the capital stock of Ambrell	$ 22,742
Estimated fair value of contingent consideration	2,302
Estimated working capital adjustments	(710)
Total preliminary purchase price	24,334
Goodwill	16,820	$ 16,820
Identifiable intangible assets	9,500
Cash	70
Trade accounts receivable	3,621
Inventories	1,917
Other current assets	200
Property and equipment	614
Accounts payable	(1,420)
Accrued expenses	(1,280)
Customer advances	(554)
Deferred tax liability	(5,154)
Total preliminary purchase price	$ 24,334