Note 12 - Stock-based Compensation Plan - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Options outstanding (in shares)	0
Options outstanding (in dollars per share)	$ 0
Granted (in shares)	19,800	0
Granted (in dollars per share)	$ 4.37
Exercised (in shares)	0
Exercised (in dollars per share)	$ 0
Canceled (in shares)	0
Canceled (in dollars per share)	$ 0
Options outstanding (in shares)	19,800	0
Options outstanding (in dollars per share)	$ 4.37	$ 0