Note 3 - Net Periodic Benefit Cost (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Service cost - benefits earned during the period	$ 14,000	$ 26,000	$ 28,000	$ 52,000
Interest cost on projected benefit obligation	247,000	238,000	494,000	476,000
Expected return on plan assets	(297,000)	(335,000)	(594,000)	(671,000)
Recognized actuarial loss	258,000	200,000	523,000	399,000
Settlement loss	52,000	311,000	307,000	311,000
Net periodic pension cost	$ 274,000	$ 440,000	$ 758,000	$ 567,000