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Note 10 - Fair Value Measurement - Schedule of Carrying and Fair Value Amounts (Details) - USD ($)
$ in Thousands

Jun. 30, 2020

Dec. 31, 2019

Jun. 30, 2019

Reported Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]

Held-to-maturity marketable securities (1)

^[1]

$ 5,896

$ 32,799

$ 61,037

Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]

2.75% Convertible Notes

^[2],[3]

196,946

193,696

0

Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]

Credit Agreement - revolving credit facility

^[3]

75,000

25,000

220,000

Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Term Loan [Member]

Notes

^[3]

135,000

138,750

142,500

Reported Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | The 2019 Notes [Member]

Notes

^[3]

0

0

40,000

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]

Held-to-maturity marketable securities (1)

^[1]

5,896

32,792

60,887

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]

2.75% Convertible Notes

^[2],[3]

184,554

249,895

0

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]

Credit Agreement - revolving credit facility

^[3]

76,291

25,043

220,597

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Term Loan [Member]

Notes

^[3]

137,116

139,042

143,109

Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | The 2019 Notes [Member]

Notes

^[3]

$ 0

$ 0

$ 40,571

[1]	All marketable securities were classified as held-to-maturity and consisted of U.S. Government and agency obligations as of June 30, 2020 and December 31, 2019, and included corporate bonds as of June 30, 2019.
[2]	Excluded from the carrying value is $33.1 and $36.3 million debt discount of as of June 30, 2020 and December 31, 2019, respectively, related to the 2.75% Convertible Notes (See Note 14)
[3]	The fair values of the 2019 Notes, Credit Agreement term loan and revolving credit facility are based on borrowing rates available to us for long-term loans with similar terms, average maturities, and credit risk. The fair value of the 2.75% Convertible Notes is based on the median price of the notes in an active market as of June 30, 2020 and December 31, 2019. See Note 14 for definitions of, and more information about, the 2019 Notes, Credit Agreement and 2.75% Convertible Notes.

X

- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

No definition available.

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X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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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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X

- Definition

Fair value portion of notes payable.

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