Note 13 - Subordinated Debentures - Summary of Subordinated Debentures (Details) (Parentheticals)	1 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Variable Interest Rate Subordinated Debentures Due in 2035 [Member]
Debt instrument, interest rate above LIBOR rate		1.42%	1.42%
Debt instrument, maturity year		2035	2035
6.75% Subordinated Notes Due in 2025 [Member]
Debt instrument, maturity year	2025	2025	2025
Debt instrument, fixed interest rate	6.75%	6.75%	6.75%