Note 12 - Deposits - Schedule of Maturity of Time Deposits (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Within one year	$ 125,075,179	$ 124,859,888
Over one year through two years	64,229,103	61,925,008
Over two years through three years	26,460,307	26,005,112
Over three years through four years	18,157,709	17,427,002
Over four years through five years	13,066,315	17,393,621
Greater than five years		22,111
Total time deposits	$ 246,988,613	$ 247,632,742