Note 13 - Fair Value Measurements - Impaired Loans and Foreclosed Real Estate, Measurements on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Sep. 30, 2016	Mar. 31, 2016
Fair Value, Inputs, Level 3 [Member]
Impaired loans	$ 6,737,559	$ 7,378,535
Foreclosed real estate	460,220	443,015
Premises and equipment held for sale	405,000	405,000
Total impaired loans and foreclosed real estate	7,602,779	8,226,550
Fair Value, Inputs, Level 2 [Member]
Loans held for sale	1,449,000	266,176
Total impaired loans and foreclosed real estate	1,449,000	266,176
Impaired loans	6,737,559	7,378,535
Foreclosed real estate	460,220	443,015
Premises and equipment held for sale	405,000	405,000
Loans held for sale	1,449,000	266,176
Total impaired loans and foreclosed real estate	$ 9,051,779	$ 8,492,726