Note 14 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Granted, shares (in shares)	68,000
Granted, weighted average grant date fair value (in dollars per share)	$ 5.89	$ 6.19	$ 4.34
Forfeited, shares (in shares)	(13,270)
Service Based Options [Member]
Nonvested, shares (in shares)	393,480
Nonvested, weighted average grant date fair value (in dollars per share)	$ 4.72
Nonvested, weighted average remaining contractual life (Year)	5 years 1 month 6 days	5 years 2 months 12 days
Granted, shares (in shares)	68,000
Granted, weighted average grant date fair value (in dollars per share)	$ 5.89
Granted, weighted average remaining contractual life (Year)	6 years 6 months
Vested, shares (in shares)	(132,558)
Vested, weighted average grant date fair value (in dollars per share)	$ 4.29
Vested, weighted average remaining contractual life (Year)	3 years 6 months
Forfeited, shares (in shares)	(10,270)
Forfeited, weighted average grant date fair value (in dollars per share)	$ 4.37
Forfeited, weighted average remaining contractual life (Year)	3 years 7 months 6 days
Nonvested, shares (in shares)	318,652	393,480
Nonvested, weighted average grant date fair value (in dollars per share)	$ 5.18	$ 4.72