Note 7 - Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended June 30,
	2013			2012
Service cost	$	1,058		$	994
Interest cost		969			1,017
Expected return on plan assets		(1,205	)		(1,145	)
Amortization of prior service cost		98			100
Amortization of net (gain) loss		776			706
Net periodic benefit cost	$	1,696		$	1,672

	Six Months Ended June 30,
	2013			2012
Service cost	$	2,115		$	1,987
Interest cost		1,939			2,034
Expected return on plan assets		(2,409	)		(2,290	)
Amortization of prior service cost		195			200
Amortization of net (gain) loss		1,552			1,413
Net periodic benefit cost	$	3,392		$	3,344