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STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 06, 2016	Dec. 09, 2015	Dec. 10, 2014	Dec. 12, 2013	Dec. 07, 2012
STOCKHOLDERS' EQUITY (Details) [Line Items]
Repurchasing Amount				$ 131	$ 80
Options outstanding (in Shares)		2,000		2,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares)		2,000		2,000
Weighted average exercise price, exercisable options (in Dollars per share)		$ 12.31		$ 12.31
Number of options forfeited (in Shares)				0
Number of options granted (in Shares)				0
Number of options exercised (in Shares)				0
Share-based Compensation		$ 0	$ 0	$ 0	$ 0
Common Class A [Member]
STOCKHOLDERS' EQUITY (Details) [Line Items]
Number of shares repurchased (in Shares)		36,748	32,605	45,947	47,552
Repurchasing Amount		$ 117	$ 50	$ 131	$ 80
Share Repurchase Renewal, December 2016 [Member]
STOCKHOLDERS' EQUITY (Details) [Line Items]
Stock repurchase program, authorized amount						$ 2,750
Share Repurchase Renewal, December 2014 [Member]
STOCKHOLDERS' EQUITY (Details) [Line Items]
Stock repurchase program, authorized amount								$ 2,750
Share Repurchase Renewal, December 2013 [Member]
STOCKHOLDERS' EQUITY (Details) [Line Items]
Stock repurchase program, authorized amount									$ 2,750
Share Repurchase Plan - December 2012 [Member]
STOCKHOLDERS' EQUITY (Details) [Line Items]
Stock repurchase program, authorized amount										$ 2,750
Share Repurchase Renewal, December 2015 [Member]
STOCKHOLDERS' EQUITY (Details) [Line Items]
Stock repurchase program, authorized amount							$ 2,750
Monthly Dividend Authorized [Member] | Scenario, Forecast [Member]
STOCKHOLDERS' EQUITY (Details) [Line Items]
Monthly Dividend Declared (in Dollars per share)	$ 0.0025
Monthly Dividends Paid [Member]
STOCKHOLDERS' EQUITY (Details) [Line Items]
Common Stock, Dividends, Per Share, Cash Paid (in Dollars per share)				$ 0.0025

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Monthly declared dividend per share.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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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.

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Gross number of share options (or share units) granted during the period.

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