Note 16 - Employee Benefit Plans - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Balance outstanding, weighted average exercise price (in dollars per share)	$ 0	$ 0	$ 5.14
Granted, weighted average exercise price (in dollars per share)	0	0	0
Exercised, weighted average exercise price (in dollars per share)	0	0	5.12
Forfeited, weighted average exercise price (in dollars per share)	0	0	0
Balance outstanding, weighted average exercise price (in dollars per share)	0	$ 0	$ 0
Options exercisable, weighted average exercise price (in dollars per share)	$ 0
Incentive Stock Options [Member]
Balance outstanding (in shares)	0	0	12,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0	0	0
Exercised (in shares)	0	0	(12,500)
Forfeited (in shares)	0	0	0
Balance outstanding (in shares)	0	0	0
Options exercisable (in shares)	0
Non-Incentive Stock Options [Member]
Balance outstanding (in shares)	0	0	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	0	0	0
Exercised (in shares)	0	0	(5,000)
Forfeited (in shares)	0	0	0
Balance outstanding (in shares)	0	0	0
Options exercisable (in shares)	0