Schedule of Statements of Operations for Discontinued Operations (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net Sales		$ 641
Income from operations		141
Other income
Gain		527
Provision for income taxes		239
Net income		429
Earnings per share Basic and diluted		$ 0.04
Weighted average shares outstanding Basic and diluted	10,688	10,672
Test Product Line [Member]
Net Sales		641
Income from operations		141
Other income
Net income		141
Earnings per share Basic and diluted		$ 0.01
Weighted average shares outstanding Basic and diluted		10,672
ACC [Member]
Other income
Gain		527
Provision for income taxes		239
Net income		$ 288
Earnings per share Basic and diluted		$ 0.03
Weighted average shares outstanding Basic and diluted		10,672