Note 4 - Goodwill and Intangible Assets (Details) - Estimated Useful Lives of Finite Lived Intangible Assets	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2013 Estimated Useful Life [Member] Sigma [Member] Customer Relationships [Member]	Jun. 30, 2013 Estimated Useful Life [Member] Sigma [Member] Computer Software, Intangible Asset [Member]	Jun. 30, 2013 Estimated Useful Life [Member] Sigma [Member] Patented Technology [Member]	Jun. 30, 2013 Estimated Useful Life [Member] Thermonics [Member] Customer Relationships [Member]	Jun. 30, 2013 Estimated Useful Life [Member] Thermonics [Member] Patented Technology [Member]	Jun. 30, 2013 Estimated Useful Life [Member] Thermonics [Member] Customer Backlog [Member]	Jun. 30, 2013 Estimated Useful Life [Member] Thermonics [Member] Trade Names [Member]	Jun. 30, 2013 Estimated Useful Life [Member] Thermonics [Member] Noncompete Agreements [Member]	Jun. 30, 2013 Remaining Estimated Useful Life [Member] Sigma [Member] Customer Relationships [Member]	Jun. 30, 2013 Remaining Estimated Useful Life [Member] Sigma [Member] Computer Software, Intangible Asset [Member]	Jun. 30, 2013 Remaining Estimated Useful Life [Member] Sigma [Member] Patented Technology [Member]	Jun. 30, 2013 Remaining Estimated Useful Life [Member] Thermonics [Member] Customer Relationships [Member]	Jun. 30, 2013 Remaining Estimated Useful Life [Member] Thermonics [Member] Patented Technology [Member]	Jun. 30, 2013 Remaining Estimated Useful Life [Member] Thermonics [Member] Trade Names [Member]	Jun. 30, 2013 Remaining Estimated Useful Life [Member] Thermonics [Member] Noncompete Agreements [Member]	Jun. 30, 2012 Customer Relationships [Member]	Jun. 30, 2012 Patented Technology [Member]	Jun. 30, 2012 Customer Backlog [Member]	Jun. 30, 2012 Trade Names [Member]	Jun. 30, 2012 Noncompete Agreements [Member]
- - - - (in months) - - - -
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										15 months	63 months	3 months	54 months 15 days	114 months 15 days	30 months 15 days	3 months