Note 9 - Premises and Equipment and Premises and Equipment Held For Sale - Summary of Premises and Equipment and Related Depreciation and Amortization (Details) - USD ($)	12 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Gross premises and equipment	$ 7,541,393	$ 6,799,470
Accumulated depreciation and amortization	(3,867,113)	(3,243,996)
Net premises and equipment	3,674,280	3,555,474
Premises and equipment depreciation and amortization	334,210	278,865
Land [Member]
Gross premises and equipment	1,064,044	1,064,046
Building and Building Improvements [Member]
Gross premises and equipment	$ 3,800,195	3,535,769
Building and Building Improvements [Member] \| Minimum [Member]
Estimated Useful Life (Year)	3 years
Building and Building Improvements [Member] \| Maximum [Member]
Estimated Useful Life (Year)	39 years
Furniture and Fixtures [Member]
Gross premises and equipment	$ 2,602,749	2,147,000
Furniture and Fixtures [Member] \| Minimum [Member]
Estimated Useful Life (Year)	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Estimated Useful Life (Year)	7 years
Automobiles [Member]
Gross premises and equipment	$ 43,505	41,015
Estimated Useful Life (Year)	5 years
Assets Not in Service [Member]
Gross premises and equipment	$ 30,900	$ 11,640

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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