Note 18 - Equity Incentive Plans - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance, shares (in shares)	35,880
Balance, weighted average exercise price (in dollars per share)	$ 23.37
Balance, remaining contractual life (Year)		1 month 6 days
Balance, intrinsic value			$ 0	$ 0	$ 0	$ 675
Exercised, shares (in shares)	(35,880)
Exercised, weighted average exercise price (in dollars per share)	$ 23.37
Balance, shares (in shares)	0	35,880
Balance, weighted average exercise price (in dollars per share)	$ 0	$ 23.37
Balance, shares (in shares)	0	35,880	0	0	0	35,880
Balance, weighted average exercise price (in dollars per share)	$ 0	$ 23.37	$ 0	$ 0	$ 0	$ 23.37