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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