Note 11 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Granted, shares (in shares)	141,500
Granted, weighted average grant date fair value (in dollars per share)	$ 5.79	$ 4.29	$ 3.85
Forfeited, shares (in shares)	(53,600)
Service Based Options [Member]
Beginning of period, nonvested, shares (in shares)	631,051
Beginning of period, nonvested, weighted average grant date fair value (in dollars per share)	$ 4.14
Nonvested, weighted average remaining contractual life (Year)	5 years 6 months	5 years 10 months 24 days
Granted, shares (in shares)	141,500
Granted, weighted average grant date fair value (in dollars per share)	$ 5.79
Granted, weighted average remaining contractual life (Year)	6 years 7 months 6 days
Vested, shares (in shares)	(174,801)
Vested, weighted average grant date fair value (in dollars per share)	$ 3.95
Vested, weighted average remaining contractual life (Year)	4 years
Forfeited, shares (in shares)	(53,600)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 4.27
Forfeited, weighted average remaining contractual life (Year)	5 years 3 months 18 days
End of period, nonvested, shares (in shares)	544,150	631,051
End of period, nonvested, weighted average grant date fair value (in dollars per share)	$ 4.62	$ 4.14