Note 11 - Acquisition of Businesses - Aggregate Consideration (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	May 02, 2018	Dec. 01, 2017
Goodwill, Ending Balance	$ 33,955	$ 33,961
CID Resources [Member]
Cash			$ 1,360
Accounts receivable			9,657
Prepaid expenses and other current assets			1,248
Inventories			30,692
Property, plant and equipment			1,134
Contract assets			2,535
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			41,020
Goodwill, Ending Balance			17,968
Total assets			105,614
Accounts payable			4,472
Deferred tax liability			9,461
Other current liabilities			967
Total liabilities			$ 14,900
Tangerine [Member]
Accounts receivable				$ 5,051
Prepaid expenses and other current assets				969
Property, plant and equipment				131
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total				6,495
Goodwill, Ending Balance				4,169
Total assets				16,815
Accounts payable				3,374
Other current liabilities				1,353
Total liabilities				$ 4,727