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Notes Payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Total notes payable $ 7,959 $ 8,997
Less current maturities 840 872
Total long-term portion 7,119 8,125
5.99% secured equipment [Member]    
Total notes payable 12
Variable rate bank notes due May 31, 2019 [Member]    
Total notes payable 4,113 4,584
Variable rate bank notes due May 31, 2018 [Member]    
Total notes payable 3,846 4,352
6.65% secured equipment [Member]    
Total notes payable $ 49