Note 7 - Restructuring Charges (Details Textual) - USD ($) $ in Thousands	3 Months Ended			7 Months Ended	12 Months Ended
	May. 31, 2015	Nov. 30, 2014	Jun. 01, 2014	Dec. 31, 2015	Mar. 03, 2013	Feb. 29, 2004
Nelco Technology Zhuhai FTZ Ltd [Member]
Gain (Loss) on Disposition of Property Plant Equipment	$ 0
Business Exit Costs	37		$ 106		$ 2,730
Other Asset Impairment Charges					3,620
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax					$ 1,465
Proceeds from Sale of Property, Plant, and Equipment	2,026
New England Laminates Co Inc [Member]
Business Exit Costs	87		161
Real Estate Held-for-sale						$ 0
UNITED STATES | Scenario, Forecast [Member]
Payments for Restructuring				$ 96
UNITED STATES
Restructuring Charges		$ 496
Payments for Restructuring	400
Proceeds from Sale of Property, Plant, and Equipment	2,026		0
Restructuring Charges	$ 124		$ 267