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, 2018	Mar. 31, 2017
Gross premises and equipment	$ 7,727,476	$ 7,541,393
Accumulated depreciation and amortization	(3,781,651)	(3,867,113)
Net premises and equipment	3,945,825	3,674,280
Premises and equipment depreciation and amortization	325,320	334,210
Land [Member]
Gross premises and equipment	1,064,046	1,064,044
Building and Building Improvements [Member]
Gross premises and equipment	$ 3,899,584	3,800,195
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	$ 2,711,893	2,602,749
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	43,505
Estimated Useful Life (Year)	5 years
Assets Not in Service [Member]
Gross premises and equipment	$ 8,448	$ 30,900

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

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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.

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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.

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