Note 11 - Stock Compensation - RRP Stock Options (Details) - Recognition and Retention Plan [Member] - USD ($)						12 Months Ended
		Nov. 16, 2011	Nov. 17, 2010	Dec. 21, 2008	Nov. 21, 2006	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Outstanding at beginning of year (in shares)						32,491	92,667
Outstanding at beginning of year, weighted average exercise price (in dollars per share)						$ 4.98	$ 10.46
Outstanding, weighted average remaining contractual term (Year)						2 years 335 days	3 years 357 days	2 years 36 days
Outstanding, aggregate intrinsic value						$ 285,522	$ 251,702
Forfeited (in shares)							(17,443)
Forfeited, weighted average exercise price (in dollars per share)							$ 12.35
Granted (in shares)		13,083	8,722	5,451	92,666	0	0
Granted, weighted average exercise price (in dollars per share)		$ 4.25	$ 6	$ 9.90	$ 12.35	$ 0	$ 0
Exercised (in shares)						(2,000)	(57,181)
Exercised, weighted average exercise price (in dollars per share)						$ 3.57	$ 10.36
Exercised, aggregate intrinsic value						$ 20,280	$ 135,519
Outstanding at end of year (in shares)						30,491	32,491	92,667
Outstanding at end of year, weighted average exercise price (in dollars per share)						$ 5.08	$ 4.98	$ 10.46
Exercisable at year end (in shares)						30,491	32,491
Exercisable at year end, weighted average exercise price (in dollars per share)						$ 5.08	$ 4.98
Exercisable at year end, weighted average remaining contractual term (Year)						2 years 335 days	3 years 357 days
Exercisable at year end, aggregate intrinsic value						$ 285,522	$ 251,702
Conversion for stock offering (in shares)	[1]						14,448
Conversion for stock offering, weighted average exercise price (in dollars per share)	[1]						$ 7.36
Conversion for stock offering , weighted average remaining contractual term (Year)	[1]						2 years 135 days
Forfeited, weighted average remaining contractual term (Year)							324 days

[1] Non-vested shares and weighted average grant date fair value were adjusted at the 1.1921 exchange ratio upon closing of the stock conversion as discussed in Note 1.