Note 18 - Shareholders' Equity (Details) - Stock Option Activity - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Option Activity [Abstract]
Options outstanding	234,100	256,100	265,437
Options outstanding, weighted average exercise price	$ 5.77	$ 5.59	$ 6.23
Options outstanding, aggregate intrinsic value	$ 319,483	$ 274,297	$ 255,121
Options outstanding, weighted average remaining contractual term	5 years 317 days	6 years 211 days	5 years 328 days
Exercisable at December 31, 2015	163,040
Exercisable at December 31, 2015	$ 5.91
Exercisable at December 31, 2015	$ 233,113
Exercisable at December 31, 2015	5 years 14 days
Granted	20,000	49,900
Granted, weighted average exercise price	$ 5.83	$ 6.35
Granted, aggregate intrinsic value		$ 40
Granted, weighted average remaining contractual term	9 years 18 days	9 years 120 days
Exercised	(38,500)	(5,700)
Exercised, weighted average exercise price	$ 4.05	$ 3.72
Exercised, aggregate intrinsic value	$ 59,494	$ 13,159
Exercised, weighted average remaining contractual term	6 years 62 days	7 years 40 days
Forfeited	(3,500)	(53,537)
Forfeited, weighted average exercise price	$ 11.59	$ 9.67
Forfeited, weighted average remaining contractual term		1 year 32 days