STOCK-BASED COMPENSATION Stock options activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Roll Forward]
Stock options outstanding - remaining contractual term	1 year 10 months 6 days	1 year 10 months 6 days
Stock options exercisable - remaining contractual term	1 year 10 months 6 days	1 year 10 months 6 days
Stock options outstanding	$ 0	$ 0
Stock options exercisable	$ 0	$ 0
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding at January 1, weighted average exercise price per share	$ 3.86	$ 6.16
Expired, weighted average exercise price per share	5.22	15.97
Options outstanding at December 31, weighted average exercise price per share	2.49	3.86
Options exercisable at December 31, weighted average exercise price per share	$ 2.49	$ 3.86
Share-based Compensation Arrangement by Share-based Payment Award [Roll Forward]
Options outstanding at January 1, number of options outstanding	100,000	123,500
Expired, number of options outstanding	(50,000)	(23,500)
Options outstanding at December 31, number of options outstanding	50,000	100,000
Options exercisable at December 31, number of options outstanding	50,000	100,000

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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Weighted average price of options that were either forfeited or expired.

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-Publisher FASB
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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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