Business Description and Summary of Significant Accounting Policies (Detail Textuals) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Business Description and Summary Of Significant Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 120,000		$ 130,000
Period of inventory expected to be used	greater than one year
Inventory reserve	770,000		778,000
Period of exceeding customer requirements of purchase quantities	1 year
Period of purchase of other products support items to maintain lead time and larger quantity	1 year
Income taxes paid	2,700	7,500
Interest paid	10,000	13,000
Exercise of stock options, net of income tax benefit	$ 21,000