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Note 6 - Investment Securities Available for Sale - Securities In a Continuous Unrealized Loss Position (Details) - USD ($)
Mar. 31, 2018
Mar. 31, 2017
Securities available for sale, less than 12 months, gross unrealized losses $ 405,150 $ 1,905,072
Securities available for sale, less than 12 months, fair value 16,603,971 84,192,747
Securities available for sale, 12 months or longer, gross unrealized losses 2,470,786 369,230
Securities available for sale, 12 months or longer, fair value 56,340,528 8,933,268
Securities available for sale, total gross unrealized losses 2,875,936 2,274,302
Securities available for sale, total fair value 72,944,499 93,126,015
US Government Agencies Debt Securities [Member]    
Securities available for sale, less than 12 months, gross unrealized losses 21,163 13,393
Securities available for sale, less than 12 months, fair value 723,023 3,256,964
Securities available for sale, 12 months or longer, gross unrealized losses 13,534
Securities available for sale, 12 months or longer, fair value 1,995,625
Securities available for sale, total gross unrealized losses 34,697 13,393
Securities available for sale, total fair value 2,718,648 3,256,964
US States and Political Subdivisions Debt Securities [Member]    
Securities available for sale, less than 12 months, gross unrealized losses 950,496
Securities available for sale, less than 12 months, fair value 13,982,251
Securities available for sale, 12 months or longer, gross unrealized losses 729,077  
Securities available for sale, 12 months or longer, fair value 11,705,991  
Securities available for sale, total gross unrealized losses 729,077 950,496
Securities available for sale, total fair value 11,705,991 13,982,251
Corporate Debt Securities [Member]    
Securities available for sale, less than 12 months, gross unrealized losses
Securities available for sale, less than 12 months, fair value
Securities available for sale, 12 months or longer, gross unrealized losses 45,924 83,478
Securities available for sale, 12 months or longer, fair value 1,954,076 1,916,522
Securities available for sale, total gross unrealized losses 45,924 83,478
Securities available for sale, total fair value 1,954,076 1,916,522
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Securities available for sale, less than 12 months, gross unrealized losses 383,987 941,183
Securities available for sale, less than 12 months, fair value 15,880,948 66,953,532
Securities available for sale, 12 months or longer, gross unrealized losses 1,682,251 285,752
Securities available for sale, 12 months or longer, fair value 40,684,836 7,016,746
Securities available for sale, total gross unrealized losses 2,066,238 1,226,935
Securities available for sale, total fair value $ 56,565,784 $ 73,970,278