Note 5 - Benefit Plans (Details) - Stock Option Activity (USD $)	6 Months Ended
	Jun. 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 June 30, 2014 (in Dollars per share)	$ 17.15
Options exercisable as of June 30, 2014 (in Dollars per share)	$ 17.98
Exercised (in Dollars per share)	$ 5.20
Forfeited (in Dollars per share)	$ 18.00
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 June 30, 2014	156,300
Options exercisable as of June 30, 2014	149,200
Exercised	(11,800)
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 June 30, 2014	95,000
Options exercisable as of June 30, 2014	85,750
Exercised	(4,500)
Forfeited	(21,500)