Note 3 - Periodic Pension Expense - Net Periodic Benefit Cost (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Service cost - benefits earned during the period	$ 16,000	$ 14,000
Interest cost on projected benefit obligation	241,000	247,000
Expected return on plan assets	(304,000)	(297,000)
Recognized actuarial loss	277,000	266,000
Settlement loss		255,000
Net periodic pension cost	$ 230,000	$ 485,000