Note 9 - Senior Notes, Credit Facilities, and Capital Leases (Details) - Annual Maturities of Capital Lease Commitments, Including Interest (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Annual Maturities of Capital Lease Commitments, Including Interest [Abstract]0
2014	$ 6,970
2015	7,120	6,049
2016	5,476	5,821
2017	2,065	4,618
Total	21,631	18,419
Less: imputed interest	(960)	(920)
Net capital lease obligation	$ 20,671	$ 17,499	$ 10,300

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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- Definition

Amount of minimum lease payments for capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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Amount of minimum lease payments maturing in the next fiscal year following the latest fiscal year for capital leases.

+ References

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Amount of minimum lease payments maturing in the forth fiscal year following the latest fiscal year for capital leases.

+ References

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Amount of minimum lease payments maturing in the third fiscal year following the latest fiscal year for capital leases.

+ References

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Amount of minimum lease payments maturing in the second fiscal year following the latest fiscal year for capital leases.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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