Note 14 - Financial Derivatives (Detail) (USD $)	9 Months Ended			9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Positive Fair Value Member	Dec. 31, 2011 Positive Fair Value Member	Sep. 30, 2012 Negative Fair Value Member	Dec. 31, 2011 Negative Fair Value Member
Number Of Swap Agreements			5
Interest Rate Swaps Notional Amount			$ 300,000,000
Net Accrued On Interest Rate Swaps	288,000	1,200,000
Notional Amount Of Option Contract				13,500,000	4,300,000
Open Option Contracts Written, at Fair Value				7,500	29,000
Sum of Spot and Forward Contract Notional Amount				184,700,000	238,600,000	142,200,000	128,200,000
Increase Decrease in Fair Value				$ 2,400,000	$ 2,200,000	$ 1,000,000	$ 486,000,000,000