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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Compensating Balances and Other Investments Lender Holdbacks (Details) - USD ($) | 6 Months Ended
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Oct. 31, 2016 | Oct. 31, 2015
Compensating Balances [Line Items] |  |
Compensating balance | $ 14,818,000 |
Decrease in lender holdbacks | 1,925,000 | $ 3,258,000
Increase in lender holdbacks for improvements | 614,000 | $ 578,000
First International Bank, Watford City, North Dakota [Member] |  |
Compensating Balances [Line Items] |  |
Compensating balance | 7,758,000 |
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 | 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 |

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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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