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Note 3 - Investment Securities - Contractual Maturities (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Available for Sale Amortized cost, Within one year $ 375,000
Available for Sale Fair value, Within one year 375,653
Held to Maturity Amortized cost, Within one year 1,009,284 165,677
Held to Maturity Fair value, Within one year 1,011,165 168,260
Available for Sale Amortized cost, Over one to five years 260,587
Available for Sale Fair value,Over one to five years 249,920
Held to Maturity Amortized cost, Over one to five years 590,522 780,336
Held to Maturity Fair value, Over one to five years 598,528 794,512
Available for Sale Amortized cost, Over five to ten years 870,424 1,133,940
Available for Sale Fair value, Over five to ten years 880,932 1,150,564
Held to Maturity Amortized cost, Over five to ten years 1,858,695 1,792,019
Held to Maturity Fair value, Over five to ten years 1,876,364 1,831,833
Available for Sale Amortized cost, Over ten years 376,908
Available for Sale Fair value, Over ten years 388,643
Held to Maturity Amortized cost, Over ten years 14,668,566 15,466,150
Held to Maturity Fair value, Over ten years 14,547,036 15,513,022
Available for Sale Amortized cost, total maturity 1,506,011 1,510,848
Available for Sale Fair value, total maturity 1,506,505 1,539,207
Held to Maturity Amortized cost, total maturity 18,127,067 18,204,182
Held to Maturity Fair value, total maturity 18,033,093 18,307,627
Available for Sale Amortized cost, due in monthly installments 25,870,029 26,948,103
Available for Sale Fair value, due in monthly installments 25,085,486 26,390,303
Held to Maturity Amortized cost, due in monthly installments
Held to Maturity Fair value, due in monthly installments
Available for Sale Amortized cost Total 27,376,040 28,458,951
Available for Sale Fair value Total 26,591,991 27,929,510
Held to Maturity Amortized cost Total 18,127,067 18,204,182
Held to Maturity Fair value Total $ 18,033,093 $ 18,307,627