Business Description and Summary of Significant Accounting Policies (Detail Texuals) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Assets Held For Sale [Line Items]
Allowance for Doubtful Accounts	$ 108,000		$ 108,000		$ 101,000
Inventory Reserve	576,000		576,000		773,000
Period of inventory expected to be used			1 year
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	248,500	204,000	256,000	226,000
Interest paid	14,000	15,000	27,000	30,000
Exercise of stock options, net of income tax benefit	152,000		152,000
Dividends, Cash	358,000		358,000
Property, Plant and Equipment
Assets Held For Sale [Line Items]
Assets held for sale	20,000
Inventory
Assets Held For Sale [Line Items]
Assets held for sale			$ 630,000