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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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