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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 |

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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 + Details
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