Note 15 - Financial Derivatives (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Number Of Swap Agreements		5
Interest Rate Swaps Notional Amount		$ 300,000,000
Net Accrued On Interest Rate Swaps	288,000	4,900,000
Positive Fair Value Member
Notional Amount Of Option Contract	209,000,000,000	4,300,000
Open Option Contracts Written, at Fair Value	2,000	29,000
Sum of Spot and Forward Contract Notional Amount	188,100,000	238,600,000
Increase Decrease in Fair Value	2,900,000	2,200,000
Negative Fair Value Member
Sum of Spot and Forward Contract Notional Amount	133,700,000	128,200,000
Increase Decrease in Fair Value	$ 1,600,000	$ 486,000,000,000