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Note 12 - Long-term Debt (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Senior Notes, Total	$ 150,000
The Term Loan [Member]
Long-term Debt, Total	$ 440,000
Debt Instrument, Periodic Payment, Percentage	5.00%
The Term Loan [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.25%
The Term Loan [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Credit Agreement and Senior Notes [Member]
Debt Instrument, Interest Rate, Effective Percentage	3.40%	4.40%
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 450,000
Debt, Weighted Average Interest Rate	3.40%
Line of Credit Facility, Remaining Borrowing Capacity	$ 422,369
Letters of Credit Outstanding, Amount	$ 12,631	$ 6,316
Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.50%
Senior Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.84%
Number of Annual Principal Payments	5

X

- Definition

The percentage of the required periodic payments including both interest and principal payments.

+ References

No definition available.

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- Definition

Represents the number of annual principal payments.

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 470
-SubTopic 20
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- Definition

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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