Note 5 - Benefit Plans (Details) - Stock Option Activity - Jun. 30, 2015 - $ / shares	Total
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 June 30, 2015 (in Dollars per share)	19.24
Options exercisable as of June 30, 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 June 30, 2015	121,000
Options exercisable as of June 30, 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 June 30, 2015	62,500
Options exercisable as of June 30, 2015	62,500
Granted	0
Exercised	(20,000)