I. NOTES PAYABLE AND LONG-TERM DEBT (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Notes payable and long-term debt	$ 49,559	$ 42,826
Current portion of notes payable and long-term debt	(559)	(7,865)
Long term portion of notes payable and long-term debt	$ 49,000	34,961
Bank acceptance notes		$ 307
London Interbank Offered Rate (LIBOR)
Basis spread on variable rate	1.56425%	0.77167%
Term loan 1
Notes payable and long-term debt		$ 2,925
Term loan 1 \| London Interbank Offered Rate (LIBOR)
Basis spread on variable rate	2.00%
Term loan 2
Notes payable and long-term debt		9,500
Term loan 2 \| London Interbank Offered Rate (LIBOR)
Basis spread on variable rate	2.00%
Term loan 3
Notes payable and long-term debt		21,670
Term loan 3 \| London Interbank Offered Rate (LIBOR)
Basis spread on variable rate	2.00%
Note payable 1
Notes payable and long-term debt	$ 559	2,919
Stated interest rate	4.50%
Debt maturity date	May 27, 2018
Note payable 2
Notes payable and long-term debt		$ 5,812
Stated interest rate	4.00%
Debt maturity date	Mar. 31, 2019
Bank Acceptance Notes Payable
Stated interest rate	0.00%
Revolving Line of Credit \| Revolving Line of Credit 1
Notes payable and long-term debt	$ 49,000
Revolving line of credit maximum borrowing capacity	$ 50,000
Debt maturity date	Sep. 28, 2020
Revolving Line of Credit \| Revolving Line of Credit 1 \| London Interbank Offered Rate (LIBOR)
Basis spread on variable rate	1.50%

Carrying amount as of the balance sheet date of drafts and bills of exchange that have been accepted by the reporting bank, or by others for its own account, as its liability to holders of the drafts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.14)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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