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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Long-term debt (in thousands)

    March 31,   December 31,
    2017   2016
Revolving credit (uncollateralized)   $ 6,765       6,665  
5.6% to 7.9% mortgage notes                
  due in installments through 2027     32,984       34,080  
      39,749       40,745  
Less portion due within one year     4,599       4,526  
    $ 35,150       36,219