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Note 7 - Loans Receivable and Allowance for Loan Losses - Purchased Credit Impaired (PCI) Loans (Details) - USD ($)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Recorded investment at beginning of period $ 1,341,935 $ 919,729
Fair value of loans acquired during the year 1,027,518
Accretion 27,744 28,036
Reductions for payments (348,255) (633,348)
Recorded investment at end of period 1,021,424 1,341,935
Oustanding principal balance at end of period $ 1,274,022 $ 1,691,004