Note 3 - Periodic Pension Expense - Net Periodic Benefit Cost (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Service cost - benefits earned during the period	$ 15,000	$ (16,000)	$ 43,000	$ 36,000
Interest cost on projected benefit obligation	247,000	237,000	741,000	713,000
Expected return on plan assets	(297,000)	(336,000)	(891,000)	(1,007,000)
Recognized actuarial loss	253,000	199,000	776,000	598,000
Settlement loss	94,000	16,000	401,000	327,000
Net periodic pension cost	$ 312,000	$ 100,000	$ 1,070,000	$ 667,000