LONG TERM DEBT AND NOTES PAYABLE TO BANK (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total long-term debt	$ 6,618	$ 4,446
Less current maturities	5,082	2,942
Long-term debt	1,536	1,504
Grade Lane 7100, LLC [Member]
Debt Instrument [Line Items]
Total long-term debt	884	884
K and R, LLC [Member]
Debt Instrument [Line Items]
Total long-term debt	716	620
Revolving credit facility with MidCap [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 5,018	$ 2,942