Note 7 - Loans Receivable and Allowance for Loan Losses - Outstanding Commitments and Unused Lines of Credit (Details) - USD ($)	Mar. 31, 2016	Mar. 31, 2015
Unused commercial lines of credit [Member]
Outstanding commitments and unused lines of credit	$ 9,845,571	$ 8,074,686
Unused home equity lines of credit [Member]
Outstanding commitments and unused lines of credit	16,004,725	15,885,344
Unused consumer lines of credit [Member]
Outstanding commitments and unused lines of credit	29,656	31,876
Residential construction loan commitments [Member]
Outstanding commitments and unused lines of credit	8,166,473	5,325,095
Commercial construction loan commitments [Member]
Outstanding commitments and unused lines of credit	1,384,932	1,129,681
Home equity loan commitments [Member]
Outstanding commitments and unused lines of credit	536,000	337,000
Commercial loan commitments [Member]
Outstanding commitments and unused lines of credit	411,500	269,000
Standby letters of credit [Member]
Outstanding commitments and unused lines of credit	$ 273,981	$ 50,000