Note 10 - Lines of Credit and Federal Home Loan Bank Advances - Federal Home Loan Bank Advances (Details) - USD ($)	6 Months Ended	12 Months Ended
	Sep. 30, 2016	Mar. 31, 2016
Borrowing One [Member]
Amount		$ 2,000,000
Rate		0.43%
Maturity Date		Jun. 03, 2016
Borrowing Two [Member]
Amount		$ 2,000,000
Rate		0.60%
Maturity Date		Sep. 03, 2016
Borrowing Three [Member]
Amount	$ 1,500,000	$ 1,500,000
Rate	0.75%	0.75%
Maturity Date	Mar. 31, 2017	Mar. 31, 2017
Borrowing Four [Member]
Amount	$ 1,000,000	$ 1,000,000
Rate	4.24%	4.24%
Maturity Date	Jul. 31, 2017	Jul. 31, 2017
Borrowing Five [Member]
Amount	$ 1,000,000	$ 1,000,000
Rate	4.01%	4.01%
Maturity Date	Aug. 21, 2017	Aug. 21, 2017
Borrowing Six [Member]
Amount	$ 1,000,000	$ 1,000,000
Rate	0.91%	0.91%
Maturity Date	Aug. 31, 2017	Aug. 31, 2017
Borrowing Seven [Member]
Amount	$ 1,500,000	$ 1,500,000
Rate	3.23%	3.23%
Maturity Date	Nov. 24, 2017	Nov. 24, 2017
Borrowing Eight [Member]
Amount	$ 1,500,000	$ 1,500,000
Rate	3.40%	3.40%
Maturity Date	Nov. 27, 2017	Nov. 27, 2017
Borrowing Nine [Member]
Amount	$ 1,000,000	$ 1,000,000
Rate	2.60%	2.60%
Maturity Date	Jul. 02, 2018	Jul. 02, 2018
Borrowing Ten [Member]
Amount	$ 1,000,000	$ 1,000,000
Rate	3.05%	3.05%
Maturity Date	Jul. 03, 2018	Jul. 03, 2018
Borrowing Eleven [Member]
Amount	$ 1,000,000	$ 1,000,000
Rate	2.60%	2.60%
Maturity Date	Oct. 02, 2018	Oct. 02, 2018
Borrowing Twelve [Member]
Amount	$ 5,000,000
Rate	4.28%
Maturity Date	Jul. 23, 2018
Borrowing Thirteen [Member]
Amount	$ 5,000,000
Rate	3.94%
Maturity Date	Sep. 19, 2018
Borrowing Fourteen [Member]
Amount	$ 5,000,000
Rate	3.38%
Maturity Date	Oct. 02, 2018
Amount	$ 25,500,000	14,500,000
Premium on borrowings assumed	840,635	305,237
Total borrowings	$ 26,340,635	$ 14,805,237