Note 3 - Investment Securities: Schedule of Investment Securities Fair Value and Unrealized Losses (Details) - US States and Political Subdivisions Debt Securities - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 58,435,854	$ 920,927
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss	(2,609,888)	(1,022)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	58,435,854	920,927
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ (2,609,888)	$ (1,022)