Note 9 - Benefit Plans (Detail) - Net Periodic Benefit Cost (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Service cost - benefits earned during the period	$ 595,000	$ 559,000
Interest cost on projected benefit obligation	1,023,000	1,092,000
Expected return on plan assets	(1,270,000)	(1,347,000)
Amortization of prior service cost	17,000	25,000
Recognized actuarial loss	(3,469,000)	(3,215,000)
Net periodic pension cost after settlements	1,322,000	808,000
Recognized Actuarial Loss [Member]
Recognized actuarial loss	$ 957,000	$ 479,000