Note 4 - Goodwill, Intangible and Long-lived Assets (Details) - Estimated Useful Lives of Finite Lived Intangible Assets	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013 Sigma [Member] Customer Relationships [Member]	Dec. 31, 2013 Sigma [Member] Computer Software, Intangible Asset [Member]	Dec. 31, 2013 Sigma [Member] Patented Technology [Member]	Dec. 31, 2013 Thermonics [Member] Customer Relationships [Member]	Dec. 31, 2013 Thermonics [Member] Patented Technology [Member]	Dec. 31, 2013 Thermonics [Member] Customer Backlog [Member]	Dec. 31, 2013 Thermonics [Member] Trade Names [Member]	Dec. 31, 2013 Thermonics [Member] Noncompete Agreements [Member]	Dec. 31, 2012 Customer Relationships [Member]	Dec. 31, 2012 Patented Technology [Member]	Dec. 31, 2012 Customer Backlog [Member]	Dec. 31, 2012 Trade Names [Member]	Dec. 31, 2012 Noncompete Agreements [Member]
Finite-lived intangible assets resulting from the acquisition of Sigma:
Estimated Useful Life	78 months 9 days	72 months	120 months	60 months	72 months	132 months	3 months	48 months	18 months	72 months	132 months	3 months	48 months	18 months
Remaining Estimated Useful Life		9 months	57 months		48 months 15 days	108 months 15 days		24 months 15 days