Note 12 - Stock Awards - Stock Option Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Outstanding, beginning of period (in shares)	377,950	318,000
Outstanding, beginning of period, average exercise price (in dollars per share)	$ 9.80	$ 9.43
Granted (in shares)	66,150	62,150
Granted, average exercise price (in dollars per share)	$ 10.01	$ 11.71
Exercised (in shares)
Exercised, average exercise price (in dollars per share)
Expired (in shares)
Expired, average exercise price (in dollars per share)	$ 0	$ 0
Forfeited (in shares)		450
Forfeited, average exercise price (in dollars per share)		$ 11.71
Options outstanding, end of period (in shares)	444,100	379,700
Options outstanding, end of period, average exercise price (in dollars per share)	$ 9.83	$ 9.80
Options exercisable, end of period (in shares)	312,783	248,300
Options exercisable, end of period, average exercise price (in dollars per share)	$ 9.25	$ 8.71