INVESTMENTS - SALE OF INTEREST IN LEASEHOLD LAND (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended	21 Months Ended
	Jun. 30, 2018 USD ($) a	Jun. 30, 2018 USD ($) a lot	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) a increment lot	Jun. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) a
Investment [Line Items]
Sale of interest in leasehold land		$ 1,310,000	$ 0	$ 1,310,000	$ 1,678,000
Fees related to land payments	$ 1,013,000	$ 1,013,000		$ 1,013,000		$ 1,386,000	$ 1,013,000
Kaupulehu Developments
Investment [Line Items]
Area of land (in acres) | a	870	870		870			870
Number of development increments | increment				2
Sale of interest in leasehold land		$ 1,310,000	$ 0	$ 1,310,000	1,678,000
Kaupulehu Developments | KD Kaupulehu LLLP Increment I
Investment [Line Items]
Aggregate gross proceeds from sale of Increment I single family lots for calculating payments entitled to be received				$ 3,100,000
Number of single family lots sold | lot		1		1
Sale of interest in leasehold land		$ 310,000		$ 310,000
Kaupulehu Developments | KD Kaupulehu LLLP Increment II
Investment [Line Items]
Number of lots developed | lot				2
Percent of Increment II distributions				50.00%		50.00%
Contingent payments, unrecorded	$ 8,000,000	8,000,000		$ 8,000,000		$ 8,000,000	$ 8,000,000
Increment II distributions received to date	1,000,000					$ 2,500,000	3,500,000
Fees related to land payments	$ 137,000	$ 137,000		$ 137,000			$ 137,000
Kaupulehu Developments | KD Kaupulehu LLLP Increment II | Minimum
Investment [Line Items]
Payments entitled to be received as percentage of gross proceeds from sale of single family lots				8.00%
Payments entitled to be received as percentage of gross proceeds from sale of units on a lot				2.60%
Increment II lot size | a	2	2		2			2
Kaupulehu Developments | KD Kaupulehu LLLP Increment II | Maximum
Investment [Line Items]
Payments entitled to be received as percentage of gross proceeds from sale of single family lots				10.00%
Sale of interest in leasehold land					$ 1,678,000
Payments entitled to be received as percentage of gross proceeds from sale of units on a lot				3.25%
Increment II lot size | a	3	3		3			3
Kaupulehu Developments | Aggregate Gross Proceeds Range Two | KD Kaupulehu LLLP Increment I
Investment [Line Items]
Payments entitled to be received as percentage of gross proceeds from sale of single family lots				10.00%
Kaupulehu Developments | Aggregate Gross Proceeds Range Two | KD Kaupulehu LLLP Increment I | Minimum
Investment [Line Items]
Aggregate gross proceeds from sale of Increment I single family lots for calculating payments entitled to be received				$ 100,000,000
Kaupulehu Developments | Aggregate Gross Proceeds Range Two | KD Kaupulehu LLLP Increment I | Maximum
Investment [Line Items]
Aggregate gross proceeds from sale of Increment I single family lots for calculating payments entitled to be received				$ 300,000,000
Kaupulehu Developments | Aggregate Gross Proceeds Range Three | KD Kaupulehu LLLP Increment I
Investment [Line Items]
Payments entitled to be received as percentage of gross proceeds from sale of single family lots				14.00%
Kaupulehu Developments | Aggregate Gross Proceeds Range Three | KD Kaupulehu LLLP Increment I | Minimum
Investment [Line Items]
Aggregate gross proceeds from sale of Increment I single family lots for calculating payments entitled to be received				$ 300,000,000