Note 5 - Benefit Plans (Details) - Stock Option Activity (USD $)	9 Months Ended
	Sep. 30, 2014
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2014 (in Dollars per share)	$ 16.54
Balance outstanding as of September 30, 2014 (in Dollars per share)	$ 18.23
Options exercisable as of September 30, 2014 (in Dollars per share)	$ 18.81
Exercised (in Dollars per share)	$ 5.33
Forfeited (in Dollars per share)	$ 19.03
Incentive Stock Options [Member]
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2014	168,100
Balance outstanding as of September 30, 2014	140,300
Options exercisable as of September 30, 2014	133,900
Exercised	(25,100)
Forfeited	(2,700)
Non-Incentive Stock Options [Member]
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2014	121,000
Balance outstanding as of September 30, 2014	82,500
Options exercisable as of September 30, 2014	79,500
Exercised	(14,500)
Forfeited	(24,000)