Note 12 - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Pension Plan [Member]
Service cost	$ 16	$ 17
Interest cost	17	15
Expected return on plan assets	(16)	(17)
Amortization of net actuarial loss and prior service cost	2	2
Net periodic pension cost	19	17
Service cost	4	5
Interest cost	3	4
Amortization of net actuarial loss and prior service cost	(2)	(2)
Net periodic pension cost	$ 7	$ 9