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TRANSACTIONS WITH RELATED PARTIES (Details) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2016 USD ($) loan | Apr. 30, 2015 USD ($) | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($) ft²
BANKING SERVICES [Abstract] |  |  |  |
Maximum borrowing capacity | $ 100,000,000 |  |  |
Compensating balance | 13,160,000 |  |  |
Interest and fees paid amount |  | $ 1,700,000 | $ 1,000,000 |
LEASE TRANSACTION [Abstract] |  |  |  |
Sale price | $ 536,728,000 | $ 88,867,000 |  |
Mortgages Payable [Member] |  |  |  |
BANKING SERVICES [Abstract] |  |  |  |
Variable interest rate (in hundredths) | 4.54% | 5.16% |  |
Multi bank Line of Credit [Member] |  |  |  |
BANKING SERVICES [Abstract] |  |  |  |
Maximum borrowing capacity | $ 100,000,000 |  |  |
First International Bank & Trust [Member] |  |  |  |
BANKING SERVICES [Abstract] |  |  |  |
Bank service and other fees charged | 500 | $ 500 | 500 |
Interest and fees paid amount | $ 2,500,000 | 2,000,000 | 1,200,000 |
LEASE TRANSACTION [Abstract] |  |  |  |
Area of building constructed (in square feet) | ft² |  |  |  | 3,700
Lease term | 20 years |  |  |
Total cost to construct building |  |  |  | $ 1,300,000
Net rental payments received per year | $ 108,000 | 109,000 | 109,000 |
Sale price | 1,700,000 |  |  |
First International Bank & Trust [Member] | Multi bank Line of Credit [Member] |  |  |  |
BANKING SERVICES [Abstract] |  |  |  |
Maximum borrowing capacity | 11,000,000 |  |  |
Interest paid | 186,000 | 245,000 | 125,000 |
Bank services charges and fee | 77,000 | $ 40,000 | $ 40,000 |
Compensating balance | 6,000,000 |  |  |
Non interest bearing account | 1,500,000 |  |  |
Interest bearing account | $ 4,500,000 |  |  |
Percentage interest on deposited amount (in hundredths) | 0.20% |  |  |
Renaissance Heights I - Williston ND [Member] | First International Bank & Trust [Member] | Mortgages Payable [Member] |  |  |  |
BANKING SERVICES [Abstract] |  |  |  |
Number of mortgage loans outstanding | loan | 1 |  |  |
Original principal balance | $ 43,000,000 |  |  |
Variable interest rate (in hundredths) | 5.24% |  |  |
Interest paid | $ 2,200,000 |  |  |
Carrying principal balance | 42,200,000 |  |  |
Robert W Baird and Co Incorporated [Member] |  |  |  |
Sales Agreement [Abstract] |  |  |  |
Aggregate offering price | $ 75,000,000 |  |  |
Compensation of gross sales price (in hundredths) | 2.00% |  |  |

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