Note 5 - Benefit Plans (Details) - Stock Option Activity (USD $)	6 Months Ended
	Jun. 30, 2013
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding weighted average exercise price (in Dollars per share)	$ 16.38
Options exercisable as of June 30, 2013 (in Dollars per share)	$ 18.29
Exercised (in Dollars per share)	$ 5.23
Forfeited (in Dollars per share)	$ 12.97
Balance outstanding weighted average exercise price (in Dollars per share)	$ 16.46
Incentive Stock Options [Member]
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding	174,500
Options exercisable as of June 30, 2013	148,800
Exercised	(1,800)
Forfeited	(600)
Balance outstanding	172,100
Non-Incentive Stock Options [Member]
Note 5 - Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding	167,000
Options exercisable as of June 30, 2013	140,500
Exercised	0
Forfeited	(2,000)
Balance outstanding	165,000