Note 11 - Segment Information (Details) - Segment Information Identifiable Assets & Long Lived Assets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Identifiable Assets	$ 35,498	$ 32,399
Long-Lived Assets	1,196	1,250
Thermal Products [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	23,504	20,849
Mechanical Products [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	7,388	7,737
Electrical Products [Member]
Segment Reporting Information [Line Items]
Identifiable Assets	4,606	3,813
UNITED STATES
Segment Reporting Information [Line Items]
Long-Lived Assets	735	899
Foreign [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	$ 461	$ 351