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TRANSACTIONS WITH RELATED PARTIES (Details) | 12 Months Ended
--- | ---
Apr. 30, 2015 USD ($) Loan | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($) ft²
BANKING SERVICES [Abstract] |  |  |
Maximum borrowing capacity | $ 90,000,000 |  |
Compensating balance | 14,300,000 |  |
Interest and fees paid amount |  | $ 1,000,000 | $ 975,000
Construction Loan Payable [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Loans Closed or Committed | 136,200,000 | 63,100,000 |
Multi bank Line of Credit [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Maximum borrowing capacity | $ 90,000,000 |  |
Mortgage Loans on Real Estate [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Interest rate (in hundredths) | 5.93% |  |
First International Bank & Trust [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Bank service and other fees charged | $ 500 | 500 | 500
Interest and fees paid amount | $ 2,000,000 | 1,200,000 | $ 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
Estimated rental payments | $ 2,400,000 |  |
Net rental payments received per year | 109,000 | 109,000 | 11,000
First International Bank & Trust [Member] | Multi bank Line of Credit [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Maximum borrowing capacity | 11,000,000 |  |
Interest paid | 245,000 | 125,000 | 196,000
Bank services charges and fee | 40,000 | $ 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% |  |
Williston Garden [Member] | First International Bank & Trust [Member] | Mortgage Loans on Real Estate [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Number of mortgage loans outstanding | Loan | 1 |  |
Original principal balance | $ 13,700,000 |  |
Interest rate (in hundredths) | 5.50% |  |
Interest paid | $ 325,000 |  |
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% |  |
Renaissance Heights I - Williston ND [Member] | First International Bank & Trust [Member] | Construction Loan Payable [Member] |  |  |
BANKING SERVICES [Abstract] |  |  |
Interest rate (in hundredths) | 5.00% |  |
Loans Closed or Committed | $ 43,700,000 |  |
Balance drawn on construction loan | 37,700,000 |  |
Interest paid | $ 1,400,000 |  |

X
- Definition Aggregate gross sales price of common shares of beneficial interest allowed to be sold related to at-the-market equity program. + References No definition available. + Details
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- Definition The area of the building to be constructed and to be leased by the entity. + References No definition available. + Details
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- Definition The amount related bank service and other fees charged on checking accounts. + References No definition available. + Details
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- Definition Represents the compensation expressed as a percentage of gross sales price. + References No definition available. + 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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- Definition This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans. + 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 210.5-02.19(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 + Details
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- Definition Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Term of the lessor's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Expenses paid for obtaining loans which includes expenses such as application and origination fees. + References No definition available. + Details
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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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- Definition The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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