Note 16 - Stock Awards - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Outstanding, beginning of year (in shares)	318,000	272,550
Outstanding, beginning of period, average exercise price (in dollars per share)	$ 9.43	$ 8.21
Granted (in shares)	62,150	70,600
Granted, average exercise price (in dollars per share)	$ 11.71	$ 13.84
Exercised (in shares)	500	21,816
Exercised, average exercise price (in dollars per share)	$ 8.12	$ 8.15
Expired (in shares)	0	0
Expired, average exercise price (in dollars per share)	$ 0	$ 0
Forfeited (in shares)	1,700	3,334
Forfeited, average exercise price (in dollars per share)	$ 11.15	$ 11.79
Options outstanding, end of year (in shares)	377,950	318,000
Options outstanding, end of period, average exercise price (in dollars per share)	$ 9.80	$ 9.43
Options exercisable, end of year (in shares)	249,467	206,133
Options exercisable, end of period, average exercise price (in dollars per share)	$ 8.72	$ 8.20