Note 18 - Employee Benefit Plans - Performance Stock Units (Details) - Performance Shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance of shares non-vested (in shares)	0	47,322	55,823
Balance of shares non-vested, weighted average grant-date price (in dollars per share)	$ 0	$ 20.48	$ 20.48
Granted (in shares)	53,075	0	0
Granted (in dollars per share)	$ 15.40	$ 0	$ 0
Vested (in shares)	0	(30,919)	0
Vested, weighted average grant-date price (in dollars per share)	$ 0	$ 20.48	$ 0
Forfeited (in shares)	0	(16,403)	(8,501)
Forfeited, weighted average grant-date price (in dollars per share)	$ 0	$ 20.48	$ 20.48
Balance of shares non-vested (in shares)	53,075	0	47,322
Balance of shares non-vested, weighted average grant-date price (in dollars per share)	$ 15.40	$ 0	$ 20.48