Note 4 - Periodic Pension Expense (Details) - Net Periodic Pension Expense (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net Periodic Pension Expense [Abstract]
Service cost - benefits earned during the period	$ 150,000	$ 149,000	$ 299,000	$ 298,000
Interest cost on projected benefit obligation	261,000	255,000	521,000	511,000
Expected return on plan assets	(333,000)	(317,000)	(666,000)	(635,000)
Amortization of prior service cost	3,000	4,000	6,000	8,000
Recognized actuarial loss	286,000	239,000	573,000	479,000
Settlement loss	249,000		249,000
Net periodic pension cost	$ 616,000	$ 330,000	$ 982,000	$ 661,000