Note 14 - Financial Derivatives (Detail) (USD $)	6 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Positive Fair Value Member	Dec. 31, 2011 Positive Fair Value Member	Jun. 30, 2012 Negative Fair Value Member	Dec. 31, 2011 Negative Fair Value Member
Number Of Swap Agreements	5		5
Interest Rate Swaps Notional Amount	$ 300,000,000		$ 300,000,000
Period Of Interest Rate Swap Agreements	3		3
Pay Weighted Average Fixed Rate	1.95%
Receive Weighted Average Variable Rate	0.47%
Net Accrued On Interest Rate Swaps	287,000	2,500,000
Interest Rate Derivative Liabilities, at Fair Value	742,000		2,600,000
Notional Amount Of Option Contract				1,100,000	4,300,000
Open Option Contracts Written, at Fair Value				2,000	29,000
Sum of Spot and Forward Contract Notional Amount				204,800,000	238,600,000	154,300,000	128,200,000
Increase Decrease in Fair Value				$ 1,900,000	$ 2,200,000	$ 1,100,000	$ 486,000,000,000