Note 3 - Net Periodic Benefit Cost (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Service cost - benefits earned during the period	$ 14,000	$ 26,000
Interest cost on projected benefit obligation	247,000	238,000
Expected return on plan assets	(297,000)	(336,000)
Recognized actuarial loss	266,000	$ 199,000
Settlement loss	255,000
Net periodic pension cost	$ 485,000	$ 127,000