DEBT (Narrative) (Details)		1 Months Ended			9 Months Ended
	Mar. 31, 2017 USD ($) item	Mar. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Jan. 31, 2017 USD ($)	May 31, 2018 USD ($)		May 31, 2017 USD ($)	Jan. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)		Aug. 31, 2015 USD ($)
Debt Instrument [Line Items]
Total					$ 105,852,000	[1]					$ 106,297,000	[2]
Repayment of short-term bank borrowings					81,758,000		$ 17,179,000
Remaining outstanding balance					69,806,000						68,034,000
Debt With Covenants [Member]
Debt Instrument [Line Items]
Line of credit, Current					40,000,000						40,000,000
Group of Subsidiaries [Member] | Debt With Covenants [Member]
Debt Instrument [Line Items]
Total					96,100,000						85,600,000
Trinidad Subsidiary [Member]
Debt Instrument [Line Items]
Remaining outstanding balance					$ 3,000,000
Miami-Dade County, Florida [Member]
Debt Instrument [Line Items]
Purchase price				$ 46,000,000
Union Bank [Member] | Miami-Dade County, Florida [Member]
Debt Instrument [Line Items]
Debt term					10 years
Credit facility funded				35,700,000
Credit facility, expiration date					Dec. 31, 2027
Citibank [Member] | Trinidad Subsidiary [Member]
Debt Instrument [Line Items]
Line of credit, Current		$ 1,500,000							$ 1,500,000	$ 3,000,000
LIBOR measurement period	90 days
Credit facility, variable interest rate	3.00%
Maximum borrowing capacity	$ 12,000,000
Number of payments | item	8
Repayment of short-term bank borrowings					$ 4,500,000
Citibank [Member] | Honduras Subsidiary [Member]
Debt Instrument [Line Items]
Proceeds from notional amount			$ 5,600,000
Scotiabank [Member] | Panama Subsidiary [Member]
Debt Instrument [Line Items]
Line of credit, Current											$ 13,300,000
Debt term		5 years
LIBOR measurement period		90 days
Derivative, variable interest rate		3.00%
Maximum borrowing capacity		$ 15,000,000
Scotiabank [Member] | Honduras Subsidiary [Member]
Debt Instrument [Line Items]
Line of credit, Current								$ 1,500,000
London Interbank Offered Rate (LIBOR) [Member] | Union Bank [Member] | Miami-Dade County, Florida [Member]
Debt Instrument [Line Items]
LIBOR measurement period					30 days
Credit facility, variable interest rate					1.70%
Interest Rate Contract [Member] | Union Bank [Member] | Miami-Dade County, Florida [Member]
Debt Instrument [Line Items]
Notional amount				$ 35,700,000
Derivative, fixed interest rate					3.65%
Derivative, effective date					Mar. 01, 2017
Derivative, maturity date					Mar. 01, 2027
Interest Rate Contract [Member] | London Interbank Offered Rate (LIBOR) [Member] | Union Bank [Member] | Miami-Dade County, Florida [Member]
Debt Instrument [Line Items]
LIBOR measurement period					30 days
Derivative, variable interest rate					1.70%
Cross Currency Interest Rate Swaps [Member] | Citibank [Member] | Honduras Subsidiary [Member]
Debt Instrument [Line Items]
Derivative, fixed interest rate			9.75%
Honduras $13.5M Cross Currency Interest Rate Swap [Member]
Debt Instrument [Line Items]
LIBOR measurement period			90 days
Cash Flow Hedging [Member] | Citibank [Member] | Honduras Subsidiary [Member]
Debt Instrument [Line Items]
Remaining outstanding balance			$ 7,900,000
Cash Flow Hedging [Member] | Honduras $13.5M Cross Currency Interest Rate Swap [Member]
Debt Instrument [Line Items]
Notional amount					$ 13,500,000								$ 13,500,000
Derivative, variable interest rate			3.00%		3.00%
Derivative, fixed interest rate					9.75%

[1] The carrying amount of non-cash assets assigned as collateral for these loans was $129.5 million. No cash assets were assigned as collateral for these loans.

[2] The carrying amount of non-cash assets assigned as collateral for these loans was $128.4 million. No cash assets were assigned as collateral for these loans.