Note 5 - Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended March 31,
	2015			2014
Service cost	$	1,711		$	1,345
Interest cost		1,254			1,070
Expected return on plan assets		(1,404	)		(1,094	)
Loss amortization		840			252
Net periodic benefit cost	$	2,401		$	1,573