Note 13 - Employee Benefit Plans (Details) - Stock Option Activity - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 13 - Employee Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2013 (in Dollars per share)	$ 18.23	$ 16.54	$ 16.38
Balance	149,000
Balance weighted average exercise price (in Dollars per share)	$ 19.58	18.23	16.54
Options exercisable as of December 31, 2015 (in Dollars per share)	19.58
Granted weighted average exercise price (in Dollars per share)	0	0	0
Exercised weighted average exercise price (in Dollars per share)	5.22	5.33	5.23
Forfeited weighted average exercise price (in Dollars per share)	$ 25.19	$ 19.03	$ 15.86
Incentive Stock Options [Member]
Note 13 - Employee Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2013	140,300	168,100	174,500
Balance	91,500	140,300	168,100
Options exercisable as of December 31, 2015	91,500
Granted	0	0	0
Exercised	(10,800)	(25,100)	(1,800)
Forfeited	(38,000)	(2,700)	(4,600)
Non-Incentive Stock Options [Member]
Note 13 - Employee Benefit Plans (Details) - Stock Option Activity [Line Items]
Balance outstanding as of January 1, 2013	82,500	121,000	167,000
Balance	57,500	82,500	121,000
Options exercisable as of December 31, 2015	57,500
Granted	0	0	0
Exercised	(25,000)	(14,500)	0
Forfeited	0	(24,000)	(46,000)