Note 22 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Before tax amount	$ (66,261)	$ (70,144)
Tax effect	15,834	16,766
Net-of-tax amount	97,464,131	88,968,366	$ 84,631,882	$ 80,478,592
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Before tax amount	517,286	4,871,052
Accumulated Other Comprehensive Income (Loss), Derivative Qualifying as Hedge, Excluded Component, Including Portion Attributable to Noncontrolling Interest [Member]
Before tax amount	(583,547)	(4,941,196)
AOCI Attributable to Parent [Member]
Net-of-tax amount	$ (50,427)	$ (53,378)	$ (431,035)	$ (452,756)