TRANSACTIONS WITH RELATED PARTIES (Details) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013 sqft	Apr. 30, 2012
BANKING SERVICES [Abstract]
Loans Closed or Committed	$ 142,828,000
Maximum borrowing capacity	72,000,000
Compensating balance	7,900,000
Non interest bearing account	1,500,000
Interest and fees paid amount		975,000	422,000
LEASE TRANSACTION [Abstract]
Total cost to construct building	52,200,000
Multi bank Line of Credit [Member]
BANKING SERVICES [Abstract]
Maximum borrowing capacity	72,000,000
First International Bank & Trust [Member]
BANKING SERVICES [Abstract]
Bank service and other fees charged	500	500	500
Interest and fees paid amount	1,200,000	1,200,000	1,100,000
LEASE TRANSACTION [Abstract]
Area of building constructed (in square feet)		3,700
Lease term	20 years
Total cost to construct building		1,300,000
Estimated rental payments	2,400,000
First International Bank & Trust [Member] | Multi bank Line of Credit [Member]
BANKING SERVICES [Abstract]
Maximum borrowing capacity	12,000,000
Interest paid	125,000	196,000	531,000
Bank services charges and fee	40,000	40,000	70,000
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	1
Principal balance	13,700,000
Interest rate (in hundredths)	5.50%
Interest paid	717,000
Compensating balance	50,000
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	17,200,000
Interest paid	$ 290,000