Note 5 - Benefit Plans (Details) - Stock Option Activity (USD $)	3 Months Ended
	Mar. 31, 2015
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2015 (in Dollars per share)	$ 18.23
Balance outstanding as of March 31, 2015 (in Dollars per share)	$ 19.24
Options exercisable as of March 31, 2015 (in Dollars per share)	$ 19.24
Granted (in Dollars per share)	$ 0
Exercised (in Dollars per share)	$ 5.23
Forfeited (in Dollars per share)	$ 23.33
Incentive Stock Options [Member]
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2015	140,300
Balance outstanding as of March 31, 2015	121,000
Options exercisable as of March 31, 2015	121,000
Granted	0
Exercised	(1,300)
Forfeited	(18,000)
Non-Incentive Stock Options [Member]
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2015	82,500
Balance outstanding as of March 31, 2015	62,500
Options exercisable as of March 31, 2015	62,500
Granted	0
Exercised	(20,000)