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Note 10 - Fair Value Measurements (Details Textual) $ in Millions | Dec. 20, 2011 | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 15, 2018
--- | --- | --- | --- | ---
Available-for-sale Securities, Total |  | $ 19.5 |  |
Debt Security Interest Rate Stated Percentage |  | 7.50% |  |
Debt Security, Available-For-Sale, Fair Value Discount Amount |  | $ 2.7 | $ 2.8 |
Business Combination Contingent Consideration Arrangements, Payment To Option Holder Percentage Of Ebitda | 1.00% |  |  |
Business Combination Contingent Consideration, Period of Monthly Payments | 10 years |  |  |
Other Long-Term Debt [Member] |  |  |  |
Long-term Debt, Term |  |  |  | 96 months
Prepaid Expenses and Other Current Assets [Member] |  |  |  |
Available-for-sale Securities, Current, Total |  | 0.6 | 0.5 |
Other Assets [Member] |  |  |  |
Available-for-sale Securities, Total |  | 15.4 | 15.3 |
Accounts Payable and Accrued Liabilities [Member] |  |  |  |
Business Combination, Contingent Consideration, Liability, Current |  | 0.9 | 0.8 |
Other Liabilities [Member] |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  | $ 1.2 | $ 1.6 |
Measurement Input, Discount Rate [Member] |  |  |  |
Debt Securities, Available-for-sale, Measurement Input |  | 0.106 | 0.112 |
Business Combination, Contingent Consideration, Liability, Measurement Input |  | 0.069 | 0.068 |

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