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Note 5 - Long-term Debt (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Jun. 30, 2019
Other Line Of Credit [Member]
Long-term Line of Credit, Total		$ 0
Line of Credit Facility, Maximum Borrowing Capacity		$ 9,500
Other Line Of Credit [Member] | Minimum [Member]
Line of Credit Facility, Interest Rate During Period		2.50%
Other Line Of Credit [Member] | Maximum [Member]
Line of Credit Facility, Interest Rate During Period		6.50%
Syndicated Facility Agreement [Member]
Long-term Debt, Total		$ 598,900
Long-term Line of Credit, Total		80,500
Letters of Credit Outstanding, Amount		$ 2,500
Long-term Debt, Weighted Average Interest Rate, at Point in Time		3.88%
Syndicated Facility Agreement [Member] | Term Loan [Member]
Payments of Debt Issuance Costs	$ 8,800
Debt Instrument, Unamortized Discount (Premium), Net, Total		$ 7,200

X

- Definition

Amount, after accumulated amortization, of debt discount (premium).

+ References

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-Name Accounting Standards Codification
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

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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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The effective interest rate during the reporting period.

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X

- 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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X

- 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

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Balance Type:	credit
Period Type:	instant

X

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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X

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X

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