Note 5 - Benefit Plans (Details) - Stock Option Activity (USD $)	3 Months Ended
	Mar. 31, 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 March 31, 2014 (in Dollars per share)	$ 16.52
Options exercisable as of March 31, 2014 (in Dollars per share)	$ 17.29
Granted (in Dollars per share)	$ 0
Exercised (in Dollars per share)	$ 5.21
Forfeited (in Dollars per share)	$ 18.31
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 March 31, 2014	165,300
Options exercisable as of March 31, 2014	158,200
Granted	0
Exercised	(2,800)
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 March 31, 2014	100,000
Options exercisable as of March 31, 2014	90,250
Granted	0
Exercised	0
Forfeited	(21,000)