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Note 13 - Lines of Credit and Federal Home Loan Bank Advances - Federal Home Loan Bank Advances (Details) - USD ($)
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Amount $ 35,577,250 $ 14,500,000
Premium on borrowings assumed 547,649 305,237
Total FHLB borrowings $ 36,124,899 $ 14,805,237
Borrowing One [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage [1] 0.94% 0.43%
Maturity Date [1] Jun. 09, 2017 Jun. 03, 2016
Amount [1] $ 5,550,000 $ 2,000,000
Borrowing Two [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage [2] 0.93% 0.60%
Maturity Date [2] Jun. 29, 2017 Sep. 03, 2016
Amount [2] $ 6,000,000 $ 2,000,000
Borrowing Three [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 4.24% 0.75%
Maturity Date Jul. 31, 2017 Mar. 31, 2017
Amount $ 1,000,000 $ 1,500,000
Borrowing Four [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 4.28% 4.24%
Maturity Date Jul. 31, 2017 Jul. 31, 2017
Amount $ 5,000,000 $ 1,000,000
Borrowing Five [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 4.01% 4.01%
Maturity Date Aug. 21, 2017 Aug. 21, 2017
Amount $ 1,000,000 $ 1,000,000
Borrowing Six [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 0.91% 0.91%
Maturity Date Aug. 31, 2017 Aug. 31, 2017
Amount $ 1,000,000 $ 1,000,000
Borrowing Seven [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 3.23% 3.23%
Maturity Date Nov. 24, 2017 Nov. 24, 2017
Amount $ 1,500,000 $ 1,500,000
Borrowing Eight [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 3.40% 3.40%
Maturity Date Nov. 27, 2017 Nov. 27, 2017
Amount $ 1,500,000 $ 1,500,000
Borrowing Nine [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 2.60% 2.60%
Maturity Date Jul. 02, 2018 Jul. 02, 2018
Amount $ 1,000,000 $ 1,000,000
Borrowing Ten [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 3.05% 3.05%
Maturity Date Jul. 03, 2018 Jul. 03, 2018
Amount $ 1,000,000 $ 1,000,000
Borrowing Eleven [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 3.94% 2.60%
Maturity Date Jul. 23, 2018 Oct. 02, 2018
Amount $ 5,000,000 $ 1,000,000
Borrowing Twelve [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 3.38%  
Maturity Date Sep. 19, 2018  
Amount $ 5,000,000
Borrowing Thirteen [Member] | Federal Home Loan Bank Advances [Member]    
Debt Instrument, Interest Rate, Stated Percentage 2.60%  
Maturity Date Oct. 02, 2018  
Amount $ 1,000,000
Automobile Note[Member]    
Debt Instrument, Interest Rate, Stated Percentage 1.95%  
Automobile Note[Member] | Notes Payable to Banks [Member]    
Debt Instrument, Interest Rate, Stated Percentage 1.95%  
Maturity Date Feb. 17, 2020  
Amount $ 27,250
[1] FHLB Advance is tied to three derivative cash flow hedges in increments of $1.85 million each. The three individual cash flow hedges are for a term of five, seven and ten years, respectively and are tied to the 3-month LIBOR rate. In order for the cash flow hedges to remain effective, the corresponding FHLB Advance will have to be renewed every three months until the respective cash flow hedge matures.
[2] FHLB Advance is tied to three derivative cash flow hedges in increments of $2.0 million each. The three individual cash flow hedges are for a term of five, seven and ten years, respectively and are tied to the 3-month LIBOR rate. In order for the cash flow hedges to remain effective, the corresponding FHLB Advance will have to be renewed every three months until the respective cash flow hedge matures.