Note 16 - Stockholders' Equity - Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Exercisable, beginning of period (in shares)	83,275	63,800
Exercisable, beginning of period (in dollars per share)	$ 5.20	$ 5.26
Vested (in shares)	37,138	30,381
Vested (in dollars per share)	$ 5.70	$ 5.22
Exercised (in shares)		4,906
Exercised (in dollars per share)		$ 5.15
Cancelled/Expired (in shares)	(16,950)	(6,000)
Cancelled/Expired (in dollars per share)	$ 5.17	$ 5.96
Exercisable at the end of period (in shares)	103,463	83,275
Exercisable at the end of period (in dollars per share)	$ 5.38	$ 5.20
Outstanding, beginning of period (in shares)	143,094	154,000
Outstanding, beginning of period (in dollars per share)	$ 5.22	$ 5.25
Granted (in shares)	350,000
Granted (in dollars per share)	$ 3.52
Exercised (in shares)		4,906
Exercised (in dollars per share)		$ 5.15
Cancelled/Expired (in shares)	(16,950)	(6,000)
Cancelled/Expired (in dollars per share)	$ 5.17	$ 5.96
Outstanding at the end of period (in shares)	476,144	143,094
Outstanding at the end of period (in dollars per share)	$ 3.97	$ 5.22