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Note 13 - Federal Home Loan Bank Advances and Lines of Credit (Details Textual) - USD ($)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Federal Home Loan Bank Advances Total Funding Available As A Percent Of Total Assets 25.00%  
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available $ 68,300,000 $ 88,200,000
Loans Pledged as Collateral 127,100,000 159,100,000
Derivative, Notional Amount 11,550,000  
Automobile Note [Member]    
Debt Instrument, Face Amount $ 28,805  
Debt Instrument, Interest Rate, Stated Percentage 1.95%  
Debt Instrument, Term 3 years  
Secured Debt [Member]    
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000,000  
Unsecured Debt [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 1,000,000  
Long-term Line of Credit, Total $ 0 $ 0
Federal Home Loan Bank Advances [Member] | Borrowing One [Member]    
Debt Instrument, Interest Rate, Stated Percentage [1] 1.84% 0.94%
Federal Home Loan Bank Advances [Member] | Borrowing One [Member] | Individual Cash Flow Hedge Tied to FHLB, 3 [Member]    
Derivative, Notional Amount $ 1,850,000  
Derivative, Term of Contract 10 years  
Federal Home Loan Bank Advances [Member] | Borrowing One [Member] | Individual Cash Flow Hedge Tied to FHLB, 2 [Member]    
Derivative, Term of Contract 7 years  
Federal Home Loan Bank Advances [Member] | Borrowing One [Member] | Individual Cash Flow Hedge Tied to FHLB, 1 [Member]    
Derivative, Term of Contract 5 years  
Federal Home Loan Bank Advances [Member] | Borrowing Two [Member]    
Debt Instrument, Interest Rate, Stated Percentage [2] 1.90% 0.93%
Federal Home Loan Bank Advances [Member] | Borrowing Two [Member] | Individual Cash Flow Hedge Tied to FHLB, 3 [Member]    
Derivative, Term of Contract 10 years  
Federal Home Loan Bank Advances [Member] | Borrowing Two [Member] | Individual Cash Flow Hedge Tied to FHLB, 2 [Member]    
Derivative, Term of Contract 7 years  
Federal Home Loan Bank Advances [Member] | Borrowing Two [Member] | Individual Cash Flow Hedge Tied to FHLB, 1 [Member]    
Derivative, Notional Amount $ 2,000,000  
Derivative, Term of Contract 5 years  
[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.