Note 16 - Stock Based Compensation - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Outstanding Options, at Beginning of Period (in shares)	780,080	831,080	998,480
Outstanding Options, at Beginning of Period, weighted average exercise price (in dollars per share)	$ 12.74	$ 12.73	$ 12.82
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0
Granted, weighted average exercise price (in dollars per share)
Exercised (in shares)	(54,780)	(49,000)
Exercised, weighted average exercise price (in dollars per share)	$ 15.28	$ 12.42
Forfeited or Expired (in shares)		(2,000)	(167,400)
Forfeited or Expired, weighted average exercise price (in dollars per share)		$ 17.11	$ 13.25
Outstanding Options, at End of Period (in shares)	725,300	780,080	831,080
Outstanding Options, at End of Period, weighted average exercise price (in dollars per share)	$ 12.55	$ 12.74	$ 12.73
Exercisable, at End of Period (in shares)	724,300	761,747	784,698
Exercisable, at End of Period, weighted average exercise price (in dollars per share)	$ 12.55	$ 12.64	$ 12.49