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Note 6 - Loans Receivable and Allowance for Loan Losses - Loans Receivable Excluding Loans Held for Sale (Details) - USD ($)
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Loans $ 387,840,677 $ 338,999,832  
Percentage of loans 100.00% 100.00%  
Net deferred loan origination fees and costs $ (107,359) $ (143,070)  
Loan premium (discount) 1,264,180 76,436  
Net loans 388,997,498 338,933,198  
Real Estate Loans [Member]      
Loans $ 305,387,341 $ 293,721,660  
Percentage of loans 79.00% 87.00%  
Real Estate Loans [Member] | One to four family, Residential [Member]      
Loans [1] $ 155,179,166 $ 151,019,066  
Percentage of loans [1] 40.00% 44.00%  
Real Estate Loans [Member] | One to four family, Residential construction [Member]      
Loans $ 6,752,565 $ 6,426,076  
Percentage of loans 2.00% 2.00%  
Real Estate Loans [Member] | One to four family, Investor [Member]      
Loans [2] $ 25,584,903 $ 25,522,113  
Percentage of loans [2] 7.00% 8.00%  
Real Estate Loans [Member] | Commercial [Member]      
Loans $ 113,018,296 $ 107,564,212  
Percentage of loans 29.00% 32.00%  
Real Estate Loans [Member] | Commercial construction [Member]      
Loans $ 4,852,411 $ 3,190,193  
Percentage of loans 1.00% 1.00%  
Commercial Portfolio Segment [Member]      
Loans [3] $ 40,916,461 $ 21,537,366  
Percentage of loans [3] 11.00% 6.00%  
Home equity loans [Member]      
Loans $ 20,676,227 $ 20,544,370  
Percentage of loans 5.00% 6.00%  
Consumer Portfolio Segment [Member]      
Loans [4] $ 20,860,648 $ 3,196,436  
Percentage of loans [4] 5.00% 1.00%  
Legacy Loans [Member]      
Loans $ 272,324,778 [5] $ 209,897,546 [5] $ 192,766,380
Net deferred loan origination fees and costs [5] (107,359) (143,070)  
Loan premium (discount) [5] 1,792,595 619,846  
Net loans [5] 274,010,014 210,374,322  
Legacy Loans [Member] | Real Estate Loans [Member]      
Loans [5] 199,458,910 174,842,452  
Legacy Loans [Member] | Real Estate Loans [Member] | One to four family, Residential [Member]      
Loans [1],[5] 80,477,455 67,126,677  
Legacy Loans [Member] | Real Estate Loans [Member] | One to four family, Residential construction [Member]      
Loans [5] 6,752,565 6,426,076  
Legacy Loans [Member] | Real Estate Loans [Member] | One to four family, Investor [Member]      
Loans [2],[5] 7,375,997 6,742,469  
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial [Member]      
Loans 100,857,452 [5] 92,665,689 [5] 94,173,223
Legacy Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member]      
Loans 3,995,441 [5] 1,881,541 [5] 1,655,899
Legacy Loans [Member] | Commercial Portfolio Segment [Member]      
Loans 38,988,229 [3],[5] 19,518,029 [3],[5] 19,815,173
Legacy Loans [Member] | Home equity loans [Member]      
Loans 13,802,091 [5] 13,278,229 [5] 13,737,121
Legacy Loans [Member] | Consumer Portfolio Segment [Member]      
Loans 20,075,548 [4],[5] 2,258,836 [4],[5] 2,443,559
Acquired Loans [Member]      
Loans 115,515,899 129,102,286 139,488,206
Net deferred loan origination fees and costs  
Loan premium (discount) (528,415) (543,410)  
Net loans 114,987,484 128,558,876  
Acquired Loans [Member] | Real Estate Loans [Member]      
Loans 105,928,431 118,879,208  
Acquired Loans [Member] | Real Estate Loans [Member] | One to four family, Residential [Member]      
Loans [1] 74,701,711 83,892,389  
Acquired Loans [Member] | Real Estate Loans [Member] | One to four family, Residential construction [Member]      
Loans  
Acquired Loans [Member] | Real Estate Loans [Member] | One to four family, Investor [Member]      
Loans [2] 18,208,906 18,779,644  
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial [Member]      
Loans 12,160,844 14,898,523 15,511,630
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial construction [Member]      
Loans 856,970 1,308,652 1,620,552
Acquired Loans [Member] | Commercial Portfolio Segment [Member]      
Loans 1,928,232 [3] 2,019,337 [3] 2,506,890
Acquired Loans [Member] | Home equity loans [Member]      
Loans 6,874,136 7,266,141 7,948,303
Acquired Loans [Member] | Consumer Portfolio Segment [Member]      
Loans $ 785,100 [4] $ 937,600 [4] $ 986,293
[1] "Legacy" one-to four-family residential real estate loans at December 31, 2017 includes $13.1 million of loans purchased in the third quarter of fiscal 2018; and at March 31, 2017 includes $23.4 million of loans purchased in March 2017
[2] "Investor" loans are residential mortgage loans secured by non-owner occupied one-to four-family properties.
[3] "Legacy" commercial business loans at June 30, 2017 includes $15.4 million of loans purchased in June 2017.
[4] "Legacy" consumer loans as of September 30, 2017 includes $18.4 million of recreational vehicle loans purchased in August 2017.
[5] As a result of the acquisition of Fraternity Community Bancorp, Inc., the parent company of Fraternity Federal Savings and Loan, in May 2016 and Fairmount Bancorp, Inc., the parent company of Fairmount Bank, in September 2015, we have segmented the portfolio into two components, loans originated by Hamilton Bank "Legacy" and loans acquired from Fraternity Community Bancorp, Inc. and Fairmount Bancorp, Inc. "Acquired".