Note 19 - Fair Value Measurements - Measurements On Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Impaired loans	$ 8,454,083	$ 5,371,689
Foreclosed real estate	457,778	503,094
Premises and equipment held for sale		547,884
Loans held for sale
Fair Value, Inputs, Level 1 [Member]
Impaired loans
Foreclosed real estate
Premises and equipment held for sale
Loans held for sale
Fair Value, Inputs, Level 2 [Member]
Impaired loans
Foreclosed real estate
Premises and equipment held for sale
Loans held for sale
Fair Value, Inputs, Level 3 [Member]
Impaired loans	8,454,083	5,371,689
Foreclosed real estate	457,778	503,094
Premises and equipment held for sale		547,884
Loans held for sale