Note 4 - Periodic Pension Expense (Detail) - Net Periodic Pension Expense (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Service cost - benefits earned during the period	$ 149,000	$ 149,000
Interest cost on projected benefit obligation	260,000	256,000
Expected return on plan assets	(333,000)	(318,000)
Amortization of prior service cost	3,000	4,000
Recognized actuarial loss	287,000	240,000
Net periodic pension cost	$ 366,000	$ 331,000