Note 3 - Acquisition (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jan. 16, 2012 Thermonics [Member]	Sep. 30, 2012 Thermonics [Member]	Dec. 31, 2012 Thermonics [Member]	Dec. 31, 2011 Thermonics [Member]
Note 3 - Acquisition (Details) [Line Items]
Business Combination, Consideration Transferred				$ 3,802	$ 3,802
Restructuring Charges				359			313
Business Acquisition, Transaction Costs					485			148
Goodwill, Acquired During Period				50	50
Revenues	$ 9,900	$ 10,799	$ 30,091	$ 35,106		$ 3,467