Note 8 - Derivatives Instruments and Hedging Activities (Details) - Interest Rate Swaps (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Note 8 - Derivatives Instruments and Hedging Activities (Details) - Interest Rate Swaps [Line Items]
Maturity - Notional Amount	$ 350,000	[1]	$ 350,000	[1]
Maturity - Weighted Average Fixed Pay Interest Rate	0.69%	[1]	0.69%	[1]
Over Six Months to Twelve Months [Member]
Note 8 - Derivatives Instruments and Hedging Activities (Details) - Interest Rate Swaps [Line Items]
Maturity - Notional Amount	95,000
Maturity - Weighted Average Fixed Pay Interest Rate	0.48%
Over Twelve Months to Twenty-Four Months [Member]
Note 8 - Derivatives Instruments and Hedging Activities (Details) - Interest Rate Swaps [Line Items]
Maturity - Notional Amount	40,000		135,000
Maturity - Weighted Average Fixed Pay Interest Rate	0.39%		0.45%
Over Thirty-Six Months to Forty-Eight Months [Member]
Note 8 - Derivatives Instruments and Hedging Activities (Details) - Interest Rate Swaps [Line Items]
Maturity - Notional Amount	$ 215,000		$ 215,000
Maturity - Weighted Average Fixed Pay Interest Rate	0.83%		0.83%

[1] The Company enters into interest rate swap transactions whereby the Company pays a fixed rate of interest and receives one month LIBOR.