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FINANCING ARRANGEMENTS (Details) $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 01, 2015 USD ($) item	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)		Jun. 15, 2017 USD ($)
Financing arrangements
Total long-term debt		$ 5,435		$ 5,657
Discount on Devicix Notes Payable		(53)		(63)
Debt Issuance Costs		(225)		(238)
Long-term Debt		5,157		5,356
Current maturities of long-term debt		(1,007)		(1,003)	[1]
Long-term debt - net of current maturities		$ 4,150		4,353	[1]
Devicix, LLC
Financing arrangements
Number of promissory notes | item	2
Line of credit
Financing arrangements
Weighted-average interest rate (as a percent)		3.00%
Outstanding balance		$ 8,649		8,503
Unused availability supported by entity's borrowing base		$ 3,920
Devicix Acq Note 1, subordinate debt, due July 1, 2019
Financing arrangements
Interest rate (as a percent)		4.00%
Long-term Debt		$ 351		394
Devicix Acq Note 2, subordinate debt, due July 1, 2019
Financing arrangements
Interest rate (as a percent)		4.00%
Long-term Debt		$ 457		512
Promissory note subject to offsets | Devicix, LLC
Financing arrangements
Promissory note liability	$ 1,000
Term of promissory note	4 years
Interest rate per annum	4.00%
Principal and interest payments	$ 23
Promissory note not subject to offsets | Devicix, LLC
Financing arrangements
Promissory note liability	$ 1,300
Term of promissory note	4 years
Interest rate per annum	4.00%
Principal and interest payments	$ 29
Bank of America | Line of credit
Financing arrangements
Maximum borrowing capacity						$ 16,000
Bank of America | Real estate term notes
Financing arrangements
Debt instrument, face amount						$ 5,000
Variable rate basis		one-month LIBOR
Interest rate margin on variable rate basis (as a percent)		2.25%
Interest rate (as a percent)		4.10%
Long-term Debt		$ 4,627		$ 4,751
Principal and interest payments		$ 41
Bank of America | Credit Agreement
Financing arrangements
Minimum fixed charge coverage ratio		1.00
Minimum level of cumulative EBITDA			$ 1,970
Wells Fargo Bank, N.A.
Financing arrangements
Loss on Extinguishment of Debt		$ 175
[1] The balance sheet at December 31, 2017 has been derived from the audited financial statements at that date

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