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EQUITY - Share Repurchase Program (Details) - USD ($)			3 Months Ended
	Dec. 05, 2017	Dec. 07, 2016	Jul. 31, 2018	Jul. 31, 2017
Share Repurchase Program
Repurchase period		1 year
Remaining authorized repurchase amount			$ 34,900,000
Share Repurchase Program [Member]
Share Repurchase Program
Aggregate gross sales price of common share of beneficial interest allowed to be repurchased		$ 50,000,000
Repurchase period	1 year
Shares repurchased and retired (in shares)			118,000	682,000
Aggregate cost of common shares repurchased and retired			$ 615,000	$ 3,900,000
Average cost per share (in dollars per share)			$ 5.20	$ 5.77

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount remaining of a stock repurchase plan authorized.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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