b'Weighted2017 AverageGross Gross Estimated TaxAmortized Unrealized Unrealized Fair EquivalentCost Gains Losses Value YieldAvailable for sale:U.S. Government agenciesand corporationsAfter 1 but within 5 years $1,150,000 $-$ 20,871 $1,129,129 1.48 %$1,150,000 $ - $ 20,871 $1,129,129 1.48 %Corporate BondsAfter 1 but within 5 years $1,304,371 $ 16,957 $ 5,710 $1,315,618 2.97 %After 5 but within 10 years733,208 - 13,891719,317 2.82$2,037,579 $ 16,957 $ 19,601 $2,034,935 2.92 %States and political subdivisionsWithin one year $ 215,647 $338 $- 215,985 2.16 %After 1 but within 5 years 5,561,26564,34611,373 5,614,238 2.95After 5 but within 10 years 15,855,867142,260171,852 15,826,275 2.50Over 10 years 15,887,49966,122253,969 15,699,652 2.41$37,520,278 $ 273,066 $ 437,194 $37,356,150 2.53 %Mortgage backed securities:Government issued or guaranteed $8,146,146 $ - $ 217,511 $7,928,635 1.96 %Collateralized mortgage obligations:Government issued or guaranteed $11,817,144 $ - $ 276,962 $11,540,182 2.11 %Privately issued24,247-4,70119,546 2.41$11,841,391 $ - $ 281,663 $11,559,728 2.11 %Small business obligations:Government issued or guaranteed $6,429,537 $ 3,670 $ 99,628 $6,333,579 2.33 %Total securities available for sale $67,124,931 $ 293,693 $1,076,468 $66,342,156 2.36 %Restricted:Federal Home Loan Bank stock $1,212,300 4.72 %The market value of securities pledged to secure public deposits and for other purposes as required or permitted by law totaled $19,631,731 at December 31, 2018, and $21,754,924 at December 31, 2017.Proceeds from sales of securities available for sale (excluding maturities and calls) for the years ended December 31, 2018 and 2017 were $3,269,294 and $16,249,692, respectively.Gross gains and (losses) of $19,482 and $(750) in 2018 and $220,608 and $(39,864) in 2017 were realized on the respective sales.Gross gains (losses) of $0 and $(0) and $9,807 and $(0) were realized on called securities during 2018 and 2017, respectively.The following tables show our investments gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2018 and 2017, respectively. 16'