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Short-Term and Long-Term Debt (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Components of Long-term debt    
Long-term debt $ 28,725,000 $ 26,701,000
Less current portion (39,000) (37,000)
Long-term debt, noncurrent 232,000 253,000
Note payable to a bank [Member]
   
Components of Long-term debt    
Long-term debt $ 271,000 $ 290,000