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Note 2 - Available-for-sale Securities - Scheduled Maturities (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Due in one year or less, amortized cost $ 1,400,829 $ 1,254,321
Due in one year or less, fair value 1,399,416 1,256,906
Due after one to five years, amortized cost 26,067,010 21,574,631
Due after one to five years, fair value 25,268,158 21,306,086
Due after five to ten years, amortized cost 2,563,872 1,878,905
Due after five to ten years, fair value 2,565,802 1,836,889
Due after ten years, amortized cost
Due after ten years, fair value
Total, amortized cost 30,031,711 24,707,857
Total, fair value $ 29,233,376 $ 24,399,881