BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES, Compensating Balances and Other Investments; Holdbacks (Details) - USD ($)	9 Months Ended
Jan. 31, 2016	Jan. 31, 2015
Compensating Balances [Line Items]
Compensating balances	$ 13,160,000
Decrease in lender holdbacks	3,906,000	$ 11,063,000
Increase in lender holdbacks	862,000	$ 913,000
First International Bank, Watford City, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	6,000,000
Associated Bank, Green Bay, Wisconsin [Member]
Compensating Balances [Line Items]
Compensating balances	3,000,000
Private Bank, Minneapolis, Minnesota [Member]
Compensating Balances [Line Items]
Compensating balances	2,000,000
Bremer Bank, Saint Paul, Minnesota [Member]
Compensating Balances [Line Items]
Compensating balances	1,285,000
Dacotah Bank, Minot, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	$ 350,000
Remaining terms of certificates of deposit	6 months
Dacotah Bank, Minot, North Dakota [Member] \| Other Investments [Member]
Compensating Balances [Line Items]
Certificates of deposit	$ 50,000
Peoples State Bank of Velva, North Dakota [Member]
Compensating Balances [Line Items]
Compensating balances	225,000
American National Bank, Omaha, Nebraska [Member]
Compensating Balances [Line Items]
Compensating balances	200,000
Commerce Bank, a Minnesota Banking Corporation [Member]
Compensating Balances [Line Items]
Compensating balances	$ 100,000

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

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

+ References

No definition available.

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- Definition

The remaining terms of certificates of deposit during the period.

+ References

No definition available.

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- Definition

A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 2: 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

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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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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