Note 1 - Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

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		15,250		$	44.38
Vested		(5,400	)	$	20.02
Cancelled		(1,400	)	$	27.00
Unvested, June 30, 2013		106,150		$	27.79

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		(16,732	)		39.58
Expired		(13,500	)		40.50
Options outstanding and exercisable at June 30, 2013		246,200		$	39.03		1.77	$	4,111