Note 2 - Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended					1 Months Ended					6 Months Ended		6 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Cost of Sales [Member] Not Designated as Hedging Instrument [Member] Commodity Contract [Member]	Jun. 30, 2013 Cost of Sales [Member] Not Designated as Hedging Instrument [Member] Commodity Contract [Member]	Jun. 30, 2014 Cost of Sales [Member] Not Designated as Hedging Instrument [Member] Commodity Contract [Member]	Jun. 30, 2013 Cost of Sales [Member] Not Designated as Hedging Instrument [Member] Commodity Contract [Member]	Jun. 30, 2014 Foreign Exchange Contract [Member]	Jun. 30, 2014 Foreign Exchange Contract [Member]	Jun. 30, 2013 Foreign Exchange Contract [Member]	May 19, 2014 Interest Rate Swap [Member]	Oct. 23, 2013 Interest Rate Swap [Member]	May 30, 2012 Interest Rate Swap [Member]	May 30, 2012 Interest Rate Swap One [Member]	May 30, 2012 Interest Rate Swap Two [Member]	May 30, 2012 Interest Rate Swap Three [Member]	May 30, 2012 Interest Rate Swap Four [Member]	Jun. 30, 2014 Interest Rate Swap Five [Member] London Interbank Offered Rate (LIBOR) [Member]	Jun. 30, 2014 Interest Rate Swap Five [Member]	Jun. 30, 2014 Interest Rate Swap Six [Member] London Interbank Offered Rate (LIBOR) [Member]	Jun. 30, 2014 Interest Rate Swap Six [Member]	Jun. 30, 2014 Interest Rate Swap Seven [Member] London Interbank Offered Rate (LIBOR) [Member]	Jun. 30, 2014 Interest Rate Swap Seven [Member]	Jun. 30, 2014 Maximum [Member]
Note 2 - Derivative Instruments and Hedging Activities (Details) [Line Items]
Derivative, Gain (Loss) on Derivative, Net			$ 279	$ 826	$ (47)	$ 1,118	$ (55)	$ (97)
Derivative, Higher Remaining Maturity Range																							12 months
Derivative, Number of Instruments Held									0			4
Derivative, Inception Date													Jan. 21, 2010	Jun. 29, 2010	Apr. 01, 2011	Apr. 01, 2011		Oct. 23, 2013		Oct. 23, 2013		May 19, 2014
Derivative Effective Date													Jul. 01, 2010	Oct. 01, 2010	Jul. 01, 2012	Oct. 01, 2012		Jul. 01, 2014		Jul. 01, 2014		Jul. 01, 2014
Derivative, Notional Amount													200,000	100,000	200,000	100,000		100,000		100,000		100,000
Derivative, Fixed Interest Rate													1.73%	1.025%	1.905%	2.22%		1.737%		1.742%		1.6195%
Derivative, Maturity Date													Jul. 01, 2012	Oct. 01, 2012	Jul. 01, 2013	Oct. 01, 2013
Number of New Contracts Entered										1	2
Derivative, Floor Interest Rate																	0.75%		0.75%		0.75%
Fair value of derivative contracts excluding impact of credit risk	$ (1,463)	$ 1,385