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RELATED PARTY TRANSACTIONS (Details) | 12 Months Ended
--- | ---
Apr. 30, 2017 USD ($) loan | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($)
BANKING SERVICES [Abstract] |  |  |
Interest and fees paid amount |  | $ 2,200,000 | $ 1,700,000
Mortgages Payable [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Variable interest rate (in hundredths) | 4.71% | 4.54% |
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 | 900 | $ 500 | 500
Interest and fees paid amount | $ 2,400,000 | 2,500,000 | 2,000,000
First International Bank & Trust [Member] | Mortgages Payable [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Number of mortgage loans outstanding | loan | 2 |  |
First International Bank & Trust [Member] | Multi bank Line of Credit [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Maximum borrowing capacity | $ 11,000,000 |  |
Interest paid | 106,000 | 186,000 | 245,000
Bank services charges and fee | 56,000 | $ 77,000 | $ 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] |  |  |
Original principal balance | $ 43,000,000 |  |
Variable interest rate (in hundredths) | 5.24% |  |
Fixed interest rate (in hundredths) | 4.04% |  |
Interest paid | $ 1,700,000 |  |
Commons at Southgate - Minot, ND [Member] | First International Bank & Trust [Member] | Mortgages Payable [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Original principal balance | 27,000,000 |  |
Interest paid | $ 579,000 |  |

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