Note 1 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2013

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

	Shares			Weighted- Average Grant Date Fair Value
Unvested, January 1, 2013		97,700		$	24.69
Granted		8,600		$	40.37
Cancelled		(700	)	$	25.54
Unvested, March 31, 2013		105,600		$	25.96

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]

	Shares			Exercise Price*		Remaining Contractual Life (in years)*		Intrinsic Value of Unexercised In-The Money Options (in 000’s)
Options outstanding at January 1, 2013		276,432		$	39.14		2.30
Exercised		(432	)	37.99
Options outstanding and exercisable at March 31, 2013		276,000		$	39.14		2.08	$	564