Short-Term and Long-Term Debt (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Short-Term and Long-Term Debt (Textual) [Abstract]
Liquid assets, Debt Covenant	$ 97,538,000	$ 103,773,000
Current portion	39,000	37,000
Revolving line of credit [Member]
Short-Term and Long-Term Debt (Textual) [Abstract]
Line of credit amount	30,000,000
Line of credit outstanding balance	0	0
Interest rate on line of credit	interest rate on this line of credit can float at 2.50% over a selected LIBOR rate or can be fixed at 2.25% above LIBOR for a fixed rate term.
Credit facility maturity term	October 2013
Liquid assets, Debt Covenant	75,044,000
Tangible Net Worth	307,647,000
Outstanding long-term debt	223,000
Current portion	39,000
Book value of debt secured by leased building and land	232,000
Revolving line of credit [Member] | Minimum [Member]
Short-Term and Long-Term Debt (Textual) [Abstract]
Minimum Net Worth Required for Debt Compliance	175,000,000
Liquid assets, Debt Covenant	$ 25,000,000