Note 3 - Acquisition (Details) - Finite-Lived Intangible Assets Acquired with Acquisition of Thermonics (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 2,598	$ 2,598
Weighted Average Estimated Useful Life	78 months 9 days
Fair Value [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	1,110
Fair Value [Member] | Customer Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	70
Fair Value [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	140
Fair Value [Member] | Patented Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	360
Fair Value [Member] | Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	48
Fair Value [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	1,728
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	1,480	1,480
Weighted Average Estimated Useful Life	72 months
Customer Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	70	70
Weighted Average Estimated Useful Life	3 months
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	140	140
Weighted Average Estimated Useful Life	48 months
Patented Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	590	590
Weighted Average Estimated Useful Life	132 months
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 48	$ 48
Weighted Average Estimated Useful Life	18 months