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STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 $ / shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Dec. 05, 2017 USD ($) | Dec. 06, 2016 USD ($) | Jun. 30, 2016 shares | Dec. 09, 2015 USD ($) | Dec. 10, 2014 USD ($) | Dec. 12, 2013 USD ($) | Dec. 07, 2012 USD ($)
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ |  | $ 2,740 |  |  |  |  |  |  |  |
Repurchasing Amount | $ |  | $ 141 | $ 114 |  |  |  |  |  |  |
Number of options granted |  | 2,000 | 0 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 4,000 | 2,000 |  |  | 2,000 |  |  |  |
Monthly Dividends Paid [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ / shares |  | $ 0.0025 | $ 0.0025 |  |  |  |  |  |  |
Scenario, Forecast [Member] | Monthly Dividend Authorized [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Monthly dividend | $ / shares | $ 0.0025 |  |  |  |  |  |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  | 0 | 0 |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  | 13,866,691 | 13,866,601 |  |  |  |  |  |  |
Dividends, Cash | $ |  | $ 393 | $ 394 |  |  |  |  |  |  |
Number of shares repurchased |  | 48,947 | 69,636 |  |  |  |  |  |  |
Repurchasing Amount | $ |  | $ 141 | $ 114 |  |  |  |  |  |  |
Common Class A [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Class A common stock granted |  | 7,200 | 3,600 |  |  |  |  |  |  |
Class A common stock granted | $ / shares |  | $ 2.62 | $ 1.66 |  |  |  |  |  |  |
Common Class A [Member] | Employee and Director [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustment to additional paid in capital from shares issued with a weighted average cost basis greater than the current fair value | $ |  | $ (2) | $ (5) |  |  |  |  |  |  |
Common Class C [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  | 2,068,857 | 2,068,947 |  |  |  |  |  |  |
Dividends, Cash | $ |  | $ 62 | $ 62 |  |  |  |  |  |  |
Number of shares converted |  | 90 | 180 |  |  |  |  |  |  |
Conversion ratio, shares issued as a result of stock conversion |  | 1 |  |  |  |  |  |  |  |
Share Repurchase Renewal, December 2014 [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  |  |  |  | $ 2,750 |  |
Share Repurchase Renewal, December 2016 [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  |  | $ 2,750 |  |  |  |  |
Share Repurchase Plan Renewal, December 2017 [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 |  |  |
Share Repurchase Plan, December 2012 Renewal, December 2013, December 2014, December 2015, December 2016, and December 2017 [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchasing Amount | $ |  | $ 1,300 |  |  |  |  |  |  |  |
Number of shares repurchased |  | 540,235 |  |  |  |  |  |  |  |
1989 Plan [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized under Stock Option Plan |  | 1,600,000 |  |  |  |  |  |  |  |
Award vesting period |  | 6 months |  |  |  |  |  |  |  |
Annual award vesting, percentage |  | 20.00% |  |  |  |  |  |  |  |
Stock Option Plan expiration |  | 10 years |  |  |  |  |  |  |  |
Number of options granted |  | 0 | 0 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 0 |  |  |  |  |  |  |  |
1997 Plan [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |
STOCKHOLDERS' EQUITY (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized under Stock Option Plan |  | 400,000 |  |  |  |  |  |  |  |
Stock Option Plan expiration |  | 10 years |  |  |  |  |  |  |  |
Number of options granted |  | 2,000 | 0 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  | 4,000 |  |  |  |  |  |  |  |
Options Granted, Fair Value | $ |  | $ 4 |  |  |  |  |  |  |  |

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