Note 10 - Stockholders' Equity (Details) - Summary of Stock Option Activity (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of Stock Option Activity [Abstract]
Outstanding, Number of Shares (in Shares)	84,600	121,600	115,600
Outstanding, Weighted Average Exercise Price	$ 5.04	$ 4.53	$ 4.40
Exercisable at end of year (in Shares)	72,400	84,600	121,600
Exercisable at end of year	$ 5.16	$ 5.04	$ 4.53
Weighted-average fair value of options granted during year		$ 0.97	$ 0.83
Granted (in Shares)	0	12,000	12,000
Granted		$ 6.87	$ 5.27
Exercised (in Shares)	(12,200)	(49,000)	(6,000)
Exercised	$ 4.32	$ 4.23	$ 3.50
Outstanding, Number of Shares (in Shares)	72,400	84,600	121,600
Outstanding, Weighted Average Exercise Price	$ 5.16	$ 5.04	$ 4.53