Note 7 - Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2014

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended June 30,
	2014			2013
Service cost	$	1,020		$	1,058
Interest cost		1,186			969
Expected return on plan assets		(1,249	)		(1,205	)
Amortization of prior service cost		(84	)		98
Amortization of net (gain) loss		756			776
Net periodic pension cost	$	1,629		$	1,696

	Six Months Ended June 30,
	2014			2013
Service cost	$	2,040		$	2,115
Interest cost		2,372			1,939
Expected return on plan assets		(2,498	)		(2,409	)
Amortization of prior service cost		(168	)		195
Amortization of net (gain) loss		1,512			1,552
Net periodic pension cost	$	3,258		$	3,392