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Note 11 - Subsequent Events (Details Textual) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 16, 2019 | Dec. 31, 2018 | Sep. 30, 2018
2027 Notes [Member] | Scenario, Forecast [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.00% |
Revolving Credit Facility [Member] | The 2017 Senior Credit Facility [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 100,000
Revolving Credit Facility [Member] | The 2018 Senior Credit Facility [Member] | Scenario, Forecast [Member] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200,000 |
Debt Instrument, Term |  | 5 years |
Debt Instrument, Ticking Fee Rate |  | 1.25% |
Debt Instrument, Ticking Fee Rate, Plus LIBOR | 2.50% |  |

X
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- Definition Ticking fee rate, plus LIBOR, for funds borrowed, under the debt agreement. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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