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Short-Term and Long-Term Debt (Details Textual) (USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Revolving line of credit [Member]
Dec. 31, 2011
Revolving line of credit [Member]
Jun. 30, 2012
Revolving line of credit [Member]
Minimum [Member]
Short-Term and Long-Term Debt (Textual) [Abstract]            
Line of credit amount       $ 30,000,000    
Line of credit outstanding balance       0 0  
Fixing interest rate on line of credit       Interest rate on this line of credit can be fixed 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    
Tangible net worth 302,622,000 300,439,000 276,652,000 302,893,000   175,000,000
Liquid assets 91,683,000 103,773,000   74,784,000   25,000,000
Outstanding long-term debt 28,725,000 26,701,000   232,000    
Current portion 39,000 37,000   39,000    
Book value of debt secured by leased building and land       $ 232,000