Note 1 - Stock Appreciation Rights Activity (Details) - Stock Appreciation Rights (SARs) [Member] - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015
Outstanding December 31, 2014 (in shares)	435,774	435,774
Outstanding December 31, 2014 (in dollars per share)	$ 7.82	$ 7.82
Granted (in shares)		53,292
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 18.66
Exercised (in shares)	(42,208)	(139,542)
Exercised (in dollars per share)		$ 5.77