Note 7 - Defined Benefit Plan (Details) - Components of Net Periodic Benefit Cost (Pension Plan, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 298	$ 234
Interest cost	308	370
Expected return on plan assets	(492)	(538)
Amortization of prior service cost	(50)	(50)
Recognized net actuarial loss	266	254
Net Periodic Benefit Cost	$ 330	$ 270