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Note 3 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Securities available for sale, due in three months or less, amortized cost $ 55,000  
Securities available for sale, due in three months or less, fair value 55,004  
Securities available for sale, due after three months through one year, amortized cost 714,379  
Securities available for sale, due after three months through one year, fair value 716,817  
Securities available for sale, due after one year through five years, amortized cost 4,430,045  
Securities available for sale, due after one year through five years, fair value 4,477,805  
Securities available for sale, due after five years through ten years, amortized cost 4,212,871  
Securities available for sale, due after five years through ten years, fair value 4,312,268  
Securities available for sale, due after ten years, amortized cost 4,344,278  
Securities available for sale, due after ten years, fair value 4,408,539  
Residential mortgage-backed securities, amortized cost 12,075,689  
Residential mortgage-backed securities, fair value 12,075,242  
Securities available for sale, amortized cost 25,832,262  
Securities available for sale, fair value $ 26,045,675 $ 44,560,680