Note 15 - Derivative Instruments and Hedging Activities (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	May 31, 2006
Number of Interest Rate Derivatives Held						2
Notional Amount of Interest Rate Cash Flow Hedge Derivatives						$ 250,000,000
Payments for Loans	225,000,000
Payment to Terminate Interest Rate Swap Agreements	24,500,000
Amortization Period of Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge	2 years 109 days
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)				5,500,000
Deferred Tax Assets, Other		3,400,000		3,400,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		$ 1,596,000	$ 1,596,000	$ 3,192,000	$ 3,175,000