Note 12 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Granted, shares (in shares)	429,500
Granted, weighted average grant date fair value (in dollars per share)	$ 4.29	$ 3.85	$ 3.93
Forfeited, shares (in shares)	(13,302)
Service Based Options [Member]
Nonvested, shares (in shares)	332,562
Nonvested, weighted average grant date fair value (in dollars per share)	$ 3.71
Nonvested, weighted average remaining contractual life (Year)	5 years 10 months 24 days	4 years 9 months 18 days
Granted, shares (in shares)	429,500
Granted, weighted average grant date fair value (in dollars per share)	$ 4.29
Granted, weighted average remaining contractual life (Year)	6 years 8 months 12 days
Vested, shares (in shares)	(118,009)
Vested, weighted average grant date fair value (in dollars per share)	$ 3.48
Vested, weighted average remaining contractual life (Year)	3 years 4 months 24 days
Forfeited, shares (in shares)	(13,002)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 4.02
Forfeited, weighted average remaining contractual life (Year)	4 years 3 months 18 days
Nonvested, shares (in shares)	631,051	332,562
Nonvested, weighted average grant date fair value (in dollars per share)	$ 4.14	$ 3.71