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, 2019	Dec. 31, 2018	Dec. 31, 2017
Outstanding at beginning of year (in shares)					10,000	30,491
Outstanding at beginning of year, weighted average exercise price (in dollars per share)					$ 3.57	$ 5.08
Outstanding, weighted average remaining contractual term (Year)					1 year 321 days	2 years 321 days	2 years 335 days
Outstanding, aggregate intrinsic value					$ 76,950	$ 97,600	$ 285,522
Forfeited (in shares)
Forfeited, weighted average exercise price (in dollars per share)
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)					(2,500)	(20,491)
Exercised, weighted average exercise price (in dollars per share)					$ 3.57	$ 5.81
Exercised, aggregate intrinsic value					$ 25,650	$ 163,905
Outstanding at end of year (in shares)					7,500	10,000	30,491
Outstanding at end of year, weighted average exercise price (in dollars per share)					$ 3.57	$ 3.57	$ 5.08
Exercisable at year end (in shares)					7,500	10,000
Exercisable at year end, weighted average exercise price (in dollars per share)					$ 3.57	$ 3.57
Exercisable at year end, weighted average remaining contractual term (Year)					1 year 321 days		2 years 321 days
Exercisable at year end, aggregate intrinsic value					$ 76,950		$ 97,600