Note 3 - Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Other Nonrecurring Expense [Member] Thermonics [Member]	Dec. 31, 2011 Closure Costs [Member] Thermonics [Member]	Dec. 31, 2012 Thermonics [Member]	Jan. 16, 2012 Thermonics [Member]	Dec. 31, 2011 Thermonics [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 3,802					$ 3,802
Restructuring Charges	313			313	313
Business Acquisition, Cost of Acquired Entity, Transaction Costs			337			485	148
Business Acquisition, Purchase Price Allocation, Goodwill Amount	50					50
Revenues	$ 43,376	$ 47,266			$ 4,692