Note 8 - Equity Plans (Details) - Stock Option Activity (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Stock Option Activity [Abstract]
Outstanding, Number of Options	20,172		27,172
Outstanding, Weighted Average Exercise Price	$ 32.63		$ 27.40
Outstanding, Weighted Average Remaining Contractual Term	minus 2 years 292 days
Exercisable at June 30, 2014	20,172
Exercisable at June 30, 2014	$ 32.63
Exercisable at June 30, 2014	minus 2 years 292 days
Exercised	(7,000)	(11,667)
Exercised	$ 12.32