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Note 12 - Fair Value Measurements (Tables)
6 Months Ended
Sep. 30, 2018
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
         
September 30, 2018
 
inputs
   
inputs
   
inputs
   
Total
 
                                 
U.S. government agencies
 
$
-
   
$
2,711,667
   
$
-
   
$
2,711,667
 
Municipal bonds
 
 
-
   
 
11,492,431
   
 
-
   
 
11,492,431
 
Corporate bonds
 
 
 
 
 
 
-
   
 
1,949,132
   
 
1,949,132
 
Mortgage-backed securities
 
 
-
   
 
52,709,759
   
 
-
   
 
52,709,759
 
Total investment securities available for sale
 
$
-
   
$
66,913,857
   
$
1,949,132
   
$
68,862,989
 
   
Level 1
   
Level 2
   
Level 3
         
March 31, 2018
 
inputs
   
inputs
   
inputs
   
Total
 
                                 
U.S. government agencies
  $
-
    $
2,718,649
    $
-
    $
2,718,649
 
Municipal bonds
   
-
     
11,705,991
     
-
     
11,705,991
 
Corporate bonds
   
 
     
-
     
1,954,076
     
1,954,076
 
Mortgage-backed securities
   
-
     
59,025,404
     
16
     
59,025,420
 
Total investment securities available for sale
  $
-
    $
73,450,044
    $
1,954,092
    $
75,404,136
 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
         
September 30, 2018
 
inputs
   
inputs
   
inputs
   
Total
 
                                 
Loans - Commercial real estate loan
  $
-
    $
2,927,163
    $
-
    $
2,927,163
 
Derivative - Interest rate swap designated as fair value hedge
   
-
     
122,377
     
-
     
122,377
 
Derivatives - Interest rate swaps designated as cash flow hedge
   
-
     
412,230
     
-
     
412,230
 
   
Level 1
   
Level 2
   
Level 3
         
March 31, 2018
 
inputs
   
inputs
   
inputs
   
Total
 
                                 
Loans - Commercial real estate loan
  $
-
    $
3,022,744
    $
-
    $
3,022,744
 
Derivative - Interest rate swap designated as fair value hedge
   
-
     
69,148
     
-
     
69,148
 
Derivatives - Interest rate swaps designated as cash flow hedge
   
-
     
217,464
     
-
     
217,464
 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
         
Valuation
 
Unobservable
 
Range of
 
Description
 
Fair Value
 
Methodology
 
Inputs
 
Inputs
 
                         
Investment securities
  $
1,949,132
 
3rd party valuation
 
Discount to reflect current market conditions
 
 0.00%
-
10.00%
 
         
Valuation
 
Unobservable
 
Range of
 
Description
 
Fair Value
 
Methodology
 
Inputs
 
Inputs
 
                         
Impaired loans, net of allowance
  $
8,302,201
 
Appraised value
 
Discount to reflect current market conditions
 
 0.00%
-
25.00%
 
     
 
 
Discounted cash flows
 
Discount rates
 
 2.63%
-
7.25%
 
                         
Foreclosed real estate
  $
587,978
 
Appraised value
 
Discount to reflect current market conditions
 
 0.00%
-
25.00%
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   
Six Months
   
Fiscal Year
 
   
Ended
   
Ended
 
   
September 30, 2018
   
March 31, 2018
 
Balance, beginning of year
 
$
1,954,092
    $
1,930,786
 
                 
Transfers in:
               
Corporate bonds
 
 
-
     
1,954,076
 
Mortgage-backed securities
 
 
-
     
16
 
Municipal bonds
 
 
-
     
-
 
                 
Transfers out:
               
Corporate bonds
 
 
-
     
-
 
Mortgage-backed securities
 
 
16
     
2,473
 
Municipal bonds
 
 
-
     
1,928,313
 
                 
Change in valuation
 
 
(4,944
)
   
-
 
                 
Balance, end of year
 
$
1,949,132
    $
1,954,092
 
Fair Value Measurements, Nonrecurring [Table Text Block]
   
Level 1
   
Level 2
   
Level 3
         
September 30, 2018
 
inputs
   
inputs
   
inputs
   
Total
 
                                 
Impaired loans
 
$
-
   
$
-
   
$
8,302,201
   
$
8,302,201
 
Foreclosed real estate
 
 
-
   
 
-
   
 
587,978
   
 
587,978
 
   
Level 1
   
Level 2
   
Level 3
         
March 31, 2018
 
inputs
   
inputs
   
inputs
   
Total
 
                                 
Impaired loans
  $
-
    $
-
    $
8,454,083
    $
8,454,083
 
Foreclosed real estate
   
-
     
-
     
457,778
     
457,778
 
Summar yOf Beginning And Ending Balance Of Foreclosed Real Estate [Table Text Block]
   
Six Months
   
Fiscal Year
 
   
Ended
   
Ended
 
   
September 30, 2018
   
March 31, 2018
 
Balance at beginning of period
 
$
457,778
    $
503,094
 
Transfer to foreclosed real estate
 
 
150,052
     
23,834
 
Write-down of foreclosed real estate
 
 
-
     
(31,955
)
Proceeds from sale of foreclosed real estate
 
 
(19,641
)
   
(35,896
)
Loss on sale of foreclosed real estate
 
 
(211
)
   
(1,299
)
Balance at end of period
 
$
587,978
    $
457,778
 
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
September 30, 2018
   
March 31, 2018
 
   
Carrying
   
Fair
   
Carrying
   
Fair
 
   
amount
   
value
   
amount
   
value
 
Financial assets
                               
Level 1 inputs
                               
Cash and cash equivalents
 
$
22,025,835
   
$
22,025,835
    $
23,368,415
    $
23,368,415
 
                                 
Level 2 inputs
                               
Federal Home Loan Bank stock
 
 
2,782,400
   
 
2,782,400
     
3,122,400
     
3,122,400
 
Bank-owned life insurance
 
 
17,684,501
   
 
17,684,501
     
17,455,850
     
17,455,850
 
                                 
Level 3 inputs
                               
Certificates of deposit held as investment
 
 
499,144
   
 
484,051
     
499,189
     
492,751
 
Loans receivable, net of unearned income
 
 
372,890,164
   
 
362,598,185
     
387,328,993
     
385,818,260
 
                                 
Financial liabilities
                               
Level 2 inputs
                               
Deposits
 
 
388,470,615
   
 
389,242,489
     
405,142,975
     
405,026,957
 
Advance payments by borrowers for taxes and insurance
 
 
1,216,584
   
 
1,216,584
     
1,962,665
     
1,962,665
 
Borrowings
 
 
53,551,896
   
 
52,396,435
     
60,672,140
     
60,494,922