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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)
6 Months Ended
Oct. 31, 2015
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
Components of Compensating Balances
At October 31, 2015, our compensating balances totaled $13.4 million and consisted of the following:
 
Financial Institution
     
First International Bank, Watford City, ND
 
$
6,000,000
 
Associated Bank, Green Bay, WI
  
3,000,000
 
The PrivateBank, Minneapolis, MN
  
2,000,000
 
Bremer Bank, Saint Paul, MN
  
1,285,000
 
Dacotah Bank, Minot, ND
  
350,000
 
United Community Bank, Minot, ND
  
275,000
 
Peoples State Bank, Velva, ND
  
225,000
 
American National Bank, Omaha, NE
  
200,000
 
Commerce Bank a Minnesota Banking Corporation
  
100,000
 
Total
 
$
13,435,000
 
Identified Intangible Assets and Intangible Liabilities
Our identified intangible assets and intangible liabilities at October 31, 2015 and April 30, 2015 were as follows:
 
  
(in thousands)
 
  
October 31, 2015
  
April 30, 2015
 
Identified intangible assets (included in intangible assets):
    
Gross carrying amount
 
$
45,127
  
$
45,823
 
Accumulated amortization
  
(19,839
)
  
(19,610
)
Net carrying amount
 
$
25,288
  
$
26,213
 
         
Identified intangible liabilities (included in other liabilities):
        
Gross carrying amount
 
$
159
  
$
82
 
Accumulated amortization
  
(44
)
  
(61
)
Net carrying amount
 
$
115
  
$
21
 
Estimated Annual Amortization of Acquired Below-Market Leases, Net of Acquired Above-Market Leases
The estimated annual amortization of acquired below-market leases, net of acquired above-market leases, for each of the five succeeding fiscal years is as follows:
 
Year Ended April 30,
 
(in thousands)
 
2017
 
$
3
 
2018
  
(11
)
2019
  
(20
)
2020
  
(16
)
2021
  
(13
)
Estimated Annual Amortization of All Other Identified Intangible Assets
The estimated annual amortization of all other identified intangible assets for each of the five succeeding fiscal years is as follows:
 
Year Ended April 30,
 
(in thousands)
 
2017
 
$
3,835
 
2018
  
3,605
 
2019
  
3,507
 
2020
  
3,440
 
2021
  
3,312