Note 4 - Property and Equipment, net (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 30, 2012 sqft acre
Area of Real Estate Property (in Square feet)				106,262
Area of Land (in Acres)				5.5
Payments to Acquire Property, Plant, and Equipment	$ 21,059,000	$ 21,022,000	$ 22,779,000
Property, Plant and Equipment, Additions	7,000,000
Property, Plant and Equipment, Useful Life	40 years
Depreciation	9,300,000	8,700,000	7,900,000
Office Building [Member]
Payments to Acquire Property, Plant, and Equipment	11,000,000
Building [Member]
Payments to Acquire Property, Plant, and Equipment	5,000,000
Land [Member]
Payments to Acquire Property, Plant, and Equipment	$ 6,000,000