Note 10 - Retirement Plans (Detail) - Net Periodic Benefit Cost (Retirement Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Retirement Plan [Member]
Service cost	$ 26	$ 22
Interest cost	29	32
Recognized net actuarial loss	8	2
Net periodic benefit cost	$ 63	$ 56
Major assumptions:
Discount rate used to determine net period benefit cost	4.39%	5.55%
Discount rate used to determine benefit obligation at year end	4.03%	4.39%