Note 3 - Acquisition (Detail) - Finite-Lived Intangible Assets Acquired with Acquisition of Thermonics (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012
Fair Value (in Dollars)		$ 2,598	$ 2,598
Weighted Average Estimated Useful Life	78 months 9 days
Fair Value [Member] | Customer Relationships [Member]
Fair Value (in Dollars)	1,110
Fair Value [Member] | Customer Backlog [Member]
Fair Value (in Dollars)	70
Fair Value [Member] | Trade Names [Member]
Fair Value (in Dollars)	140
Fair Value [Member] | Patented Technology [Member]
Fair Value (in Dollars)	360
Fair Value [Member] | Noncompete Agreements [Member]
Fair Value (in Dollars)	48
Fair Value [Member]
Fair Value (in Dollars)	1,728
Customer Relationships [Member]
Fair Value (in Dollars)		1,480	1,480
Weighted Average Estimated Useful Life	72 months
Customer Backlog [Member]
Fair Value (in Dollars)		70	70
Weighted Average Estimated Useful Life	3 months
Trade Names [Member]
Fair Value (in Dollars)		140	140
Weighted Average Estimated Useful Life	48 months
Patented Technology [Member]
Fair Value (in Dollars)		590	590
Weighted Average Estimated Useful Life	132 months
Noncompete Agreements [Member]
Fair Value (in Dollars)		$ 48	$ 48
Weighted Average Estimated Useful Life	18 months