Note 7 - Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Effect on other comprehensive income (loss), net	$ 184,273	$ (139,948)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated other comprehensive income (loss), before tax	(259,974)	972
Other comprehensive income (loss) before reclassification, before tax	233,647	(192,907)
Reclassification adjustment for realized investment (loss) gains, net, included in realized gains on investments, before tax	9,478	(1,406)
Effect on other comprehensive income (loss), before tax	243,125	(194,313)
Other comprehensive income (loss) before reclassification, before tax	233,647	(192,907)
Accumulated other comprehensive income (loss), before tax	(16,849)	(193,341)
Accumulated other comprehensive income (loss), tax	(54,489)	335
Other comprehensive income (loss) before reclassification, tax	49,089	(40,510)
Reclassification adjustment for realized investment (loss) gains, net, included in realized gains on investments, tax	1,990	(295)
Effect on other comprehensive income (loss), tax	51,079	(40,805)
Other comprehensive income (loss) before reclassification, tax	49,089	(40,510)
Accumulated other comprehensive income (loss), tax	(3,410)	(40,470)
Accumulated other comprehensive income (loss), net	(205,485)	637
Other comprehensive income (loss) before reclassification, net	184,558	(152,397)
Reclassification adjustment for realized investment (loss) gains, net, included in realized gains on investments, net	7,488	(1,111)
Effect on other comprehensive income (loss), net	192,046	(153,508)
Other comprehensive income (loss) before reclassification, net	184,558	(152,397)
Accumulated other comprehensive income (loss), net	(13,439)	(152,871)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated other comprehensive income (loss), before tax	16,986	7,005
Other comprehensive income (loss) before reclassification, before tax	(9,839)	17,165
Effect on other comprehensive income (loss), before tax	(9,839)	17,165
Other comprehensive income (loss) before reclassification, before tax	(9,839)	17,165
Accumulated other comprehensive income (loss), before tax	7,147	24,170
Accumulated other comprehensive income (loss), tax	4,477	2,381
Other comprehensive income (loss) before reclassification, tax	(2,066)	3,605
Effect on other comprehensive income (loss), tax	(2,066)	3,605
Other comprehensive income (loss) before reclassification, tax	(2,066)	3,605
Accumulated other comprehensive income (loss), tax	2,411	5,986
Accumulated other comprehensive income (loss), net	12,509	4,624
Other comprehensive income (loss) before reclassification, net	(7,773)	13,560
Effect on other comprehensive income (loss), net	(7,773)	13,560
Other comprehensive income (loss) before reclassification, net	(7,773)	13,560
Accumulated other comprehensive income (loss), net	4,736	18,184
AOCI Attributable to Parent [Member]
Accumulated other comprehensive income (loss), before tax	(242,988)	7,977
Effect on other comprehensive income (loss), before tax	233,286	(177,148)
Change in unrealized gains (loss) gains, net, on investments available for sale, before tax	243,125	(194,313)
Change in unrealized gains (losses), net, on interest rate swap, before tax	(9,839)	17,165
Accumulated other comprehensive income (loss), before tax	(9,702)	(169,171)
Accumulated other comprehensive income (loss), tax	(50,012)	2,716
Effect on other comprehensive income (loss), tax	49,013	(37,200)
Change in unrealized gains (loss) gains, net, on investments available for sale, tax	51,079	(40,805)
Change in unrealized gains (losses), net, on interest rate swap, tax	(2,066)	3,605
Accumulated other comprehensive income (loss), tax	(999)	(34,484)
Accumulated other comprehensive income (loss), net	(192,976)	5,261
Effect on other comprehensive income (loss), net	184,273	(139,948)
Change in unrealized gains (loss) gains, net, on investments available for sale, net	192,046	(153,508)
Change in unrealized gains (losses), net, on interest rate swap, net	(7,773)	13,560
Accumulated other comprehensive income (loss), net	$ (8,703)	$ (134,687)