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Note 10 - Lines of Credit and Federal Home Loan Bank Advances - Federal Home Loan Bank Advances (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Amount $ 35,574,139 $ 35,577,250
Premium on borrowings assumed 401,089 547,649
Total FHLB borrowings 35,975,228 36,124,899
Borrowing One [Member] | Federal Home Loan Bank Advances [Member]    
Amount [1] $ 5,550,000 $ 5,550,000
Debt Instrument, Interest Rate, Stated Percentage [1] 1.17% 0.94%
Maturity Date [1] Sep. 11, 2017 Jun. 09, 2017
Borrowing Two [Member] | Federal Home Loan Bank Advances [Member]    
Amount [2] $ 6,000,000 $ 6,000,000
Debt Instrument, Interest Rate, Stated Percentage [2] 1.18% 0.93%
Maturity Date [2] Sep. 29, 2017 Jun. 29, 2017
Borrowing Three [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 1,000,000 $ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.24% 4.24%
Maturity Date Jul. 31, 2017 Jul. 31, 2017
Borrowing Four [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 5,000,000 $ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.28% 4.28%
Maturity Date Jul. 31, 2017 Jul. 31, 2017
Borrowing Five [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 1,000,000 $ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage 4.01% 4.01%
Maturity Date Aug. 21, 2017 Aug. 21, 2017
Borrowing Six [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 1,000,000 $ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage 0.91% 0.91%
Maturity Date Aug. 31, 2017 Aug. 31, 2017
Borrowing Seven [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 1,500,000 $ 1,500,000
Debt Instrument, Interest Rate, Stated Percentage 3.23% 3.23%
Maturity Date Nov. 24, 2017 Nov. 24, 2017
Borrowing Eight [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 1,500,000 $ 1,500,000
Debt Instrument, Interest Rate, Stated Percentage 3.40% 3.40%
Maturity Date Nov. 27, 2017 Nov. 27, 2017
Borrowing Nine [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 1,000,000 $ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage 2.60% 2.60%
Maturity Date Jul. 02, 2018 Jul. 02, 2018
Borrowing Ten [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 1,000,000 $ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.05% 3.05%
Maturity Date Jul. 03, 2018 Jul. 03, 2018
Borrowing Eleven [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 5,000,000 $ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.94% 3.94%
Maturity Date Jul. 23, 2018 Jul. 23, 2018
Borrowing Twelve [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 5,000,000 $ 5,000,000
Debt Instrument, Interest Rate, Stated Percentage 3.38% 3.38%
Maturity Date Sep. 19, 2018 Sep. 19, 2018
Borrowing Thirteen [Member] | Federal Home Loan Bank Advances [Member]    
Amount $ 1,000,000 $ 1,000,000
Debt Instrument, Interest Rate, Stated Percentage 2.60% 2.60%
Maturity Date Oct. 02, 2018 Oct. 02, 2018
Automobile Note [Member]    
Debt Instrument, Interest Rate, Stated Percentage 1.95%  
Automobile Note [Member] | Notes Payable to Banks [Member]    
Amount $ 24,139 $ 27,250
Debt Instrument, Interest Rate, Stated Percentage 1.95% 1.95%
Maturity Date Feb. 17, 2020 Feb. 17, 2020
[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.