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Note 8 - Fair Value Measurements (Details Textual) $ in Millions | Dec. 20, 2011 | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 15, 2018
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale, Total |  | $ 19.0 |  |
Debt Security Interest Rate Stated Percentage |  | 7.50% |  |
Debt Security, Available-For-Sale, Fair Value Discount Amount |  | $ 2.6 | $ 2.7 |
Business Combination Contingent Consideration Arrangements, Payment To Option Holder Percentage Of Ebitda | 1.00% |  |  |
Other Long-Term Debt [Member] |  |  |  |
Long-term Debt, Term (Month) |  |  |  | 96 months
Prepaid Expenses and Other Current Assets [Member] |  |  |  |
Debt Securities, Available-for-sale, Current, Total |  | 0.6 | 0.6 |
Other Noncurrent Assets [Member] |  |  |  |
Debt Securities, Available-for-sale, Noncurrent |  | 16.3 | 15.6 |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Business Combination, Contingent Consideration, Liability, Current |  | 0.9 | 0.9 |
Other Noncurrent Liabilities [Member] |  |  |  |
Business Combination, Contingent Consideration, Liability, Noncurrent |  | $ 0.4 | $ 0.8 |
Measurement Input, Discount Rate [Member] |  |  |  |
Debt Securities, Available-for-sale, Measurement Input |  | 0.094 | 0.105 |
Business Combination, Contingent Consideration, Liability, Measurement Input |  | 0.062 | 0.062 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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