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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Compensating Balances and Other Investments Lender Holdbacks (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
Compensating Balances [Line Items] |  |  |
Compensating balance | $ 13,160,000 |  |
Decrease in lender holdbacks | 4,347,000 | $ 10,738,000 | $ 3,780,000
Increase in lender holdbacks for improvements | 1,136,000 | $ 1,204,000 | $ 11,045,000
First International Bank, Watford City, North Dakota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balance | 6,000,000 |  |
Associated Bank, Green Bay, Wisconsin [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balance | 3,000,000 |  |
Private Bank [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balance | 2,000,000 |  |
Bremer Bank [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balance | 1,285,000 |  |
Dacotah Bank, Minot, North Dakota [Member] |  |  |
Compensating Balances [Line Items] |  |  |
Compensating balance | 350,000 |  |
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 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 |  |

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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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- 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 + Details
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