Note 4 - Periodic Pension Expense (Detail) - Net Periodic Pension Expense (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Service cost - benefits earned during the period	$ 149,000	$ 141,000	$ 298,000	$ 280,000
Interest cost on projected benefit obligation	255,000	273,000	511,000	546,000
Expected return on plan assets	(317,000)	(337,000)	(635,000)	(674,000)
Amortization of prior service cost	4,000	6,000	8,000	13,000
Recognized actuarial loss	239,000	119,000	479,000	239,000
Net periodic pension cost	$ 330,000	$ 202,000	$ 661,000	$ 404,000