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Line-of-Credit and Long-term Debt - Components of Debt (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Long-term debt consists of:    
Long-term debt $ 78,060,000us-gaap_LongTermDebt $ 81,309,000us-gaap_LongTermDebt
Less line-of-credit and current maturities of long-term debt (3,907,000)us-gaap_LongTermDebtCurrent (7,094,000)us-gaap_LongTermDebtCurrent
Long-term debt, less current portion 74,153,000us-gaap_LongTermDebtNoncurrent 74,215,000us-gaap_LongTermDebtNoncurrent
Revolving line of credit    
Long-term debt consists of:    
Long-term debt 3,660,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		 6,850,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Note payable to a bank    
Long-term debt consists of:    
Long-term debt $ 74,400,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember		 $ 74,459,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember