Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures [Line Items]
Revolving credit facility	$ 299,061us-gaap_LineOfCredit	$ 148,647us-gaap_LineOfCredit
Unamortized gain on settlement of interest rate swaps	1,828	107
Adjustments to long term debt resulting from interest rate swaps	27	(5,196)
Capital leases maturing at various dates through 2018	4,228us-gaap_CapitalLeaseObligations	2,555us-gaap_CapitalLeaseObligations
Other long-term debt maturing at various dates up to 2018	5,704us-gaap_OtherLongTermDebt	11,681us-gaap_OtherLongTermDebt
	493,348us-gaap_LongTermDebt	372,794us-gaap_LongTermDebt
Less: current portion	36,396us-gaap_LongTermDebtCurrent	44,785us-gaap_LongTermDebtCurrent
Long-term debt - non-current	456,952us-gaap_LongTermDebtNoncurrent	328,009us-gaap_LongTermDebtNoncurrent
3.84% Senior Notes [Member]
Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures [Line Items]
Notes	150,000	150,000
6.40% Senior Notes [Member]
Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures [Line Items]
Notes	12,500	25,000
5.44% Senior Notes [Member]
Note 12 - Long-term Debt (Details) - Long-term Debt and Convertible Debentures [Line Items]
Notes	$ 20,000	$ 40,000

The adjustment to senior notes resulting from interest rate swap.

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Represents the unamortized gain on settlement of interest rate swaps.

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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.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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