Note 22 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Before tax amount	$ (564,924)	$ (276,675)
Tax effect	112,168	70,482
Net-of-tax amount	80,478,592	74,891,493	$ 69,974,380	$ 66,422,465
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Before tax amount	(1,836,462)	(844,379)
Accumulated Other Comprehensive Income (Loss), Derivative Qualifying as Hedge, Excluded Component, Including Portion Attributable to Noncontrolling Interest [Member]
Before tax amount	1,271,538	567,704
AOCI Attributable to Parent [Member]
Net-of-tax amount	$ (452,756)	$ (206,193)	$ (1,309,241)	$ (683,956)