Note 4 - Periodic Pension Expense (Detail) - Net Periodic Pension Expense (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Service cost - benefits earned during the period	$ 149,000	$ 139,000	$ 447,000	$ 419,000
Interest cost on projected benefit obligation	256,000	273,000	767,000	819,000
Expected return on plan assets	(318,000)	(336,000)	(953,000)	(1,010,000)
Amortization of prior service cost	5,000	6,000	13,000	19,000
Recognized actuarial loss	239,000	120,000	718,000	359,000
Net periodic pension cost	$ 331,000	$ 202,000	$ 992,000	$ 606,000