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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Compensating Balances and Other Investments Lender Holdbacks (Details) - USD ($)	9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Compensating Balances [Line Items]
Compensating balance	$ 2,060,000
Decrease in lender holdbacks	1,688,000	$ 3,906,000
Increase in lender holdbacks for improvements	646,000	$ 862,000
Bremer Bank [Member]
Compensating Balances [Line Items]
Compensating balance	1,285,000
Dacotah Bank, Minot, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balance	250,000
Peoples State Bank of Velva, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balance	225,000
American National Bank, Omaha, Nebraska [Member]
Compensating Balances [Line Items]
Compensating balance	200,000
Commerce Bank [Member]
Compensating Balances [Line Items]
Compensating balance	$ 100,000

X

- Definition

The cash inflow associated with the decrease in lender hold backs for improvements.

+ References

No definition available.

+ Details

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- Definition

The cash outflow associated with the increase in lender hold backs for improvements.

+ References

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X

- Definition

The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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