Note 19 - Shareholders' Equity - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options outstanding (in shares)	234,100	256,100
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.77	$ 5.59
Options outstanding, aggregate intrinsic value	$ 834,625	$ 319,483	$ 274,297
Options outstanding, weighted average remaining contractual term (Year)	5 years 240 days	5 years 317 days	6 years 211 days
Granted (in shares)	0	20,000
Granted, weighted average exercise price (in dollars per share)		$ 5.83
Granted, aggregate intrinsic value
Granted, weighted average remaining contractual term (Year)		9 years 18 days
Exercised (in shares)	(1,900)	(38,500)
Exercised, weighted average exercise price (in dollars per share)	$ 5.29	$ 4.05
Exercised, aggregate intrinsic value	$ 4,789	$ 59,494
Exercised, weighted average remaining contractual term (Year) (Year)	3 years 120 days	6 years 62 days
Forfeited (in shares)	(43,300)	(3,500)
Forfeited, weighted average exercise price (in dollars per share)	$ 8.81	$ 11.59
Forfeited, weighted average remaining contractual term (Year) (Year)
Options outstanding (in shares)	188,900	234,100	256,100
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.08	$ 5.77	$ 5.59
Exercisable at December 31, 2016 (in shares)	157,340
Exercisable at December 31, 2016 (in dollars per share)	$ 4.88
Exercisable at December 31, 2016	$ 726,809
Exercisable at December 31, 2016 (Year)	5 years 102 days