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Note 9 - Fair Value Measurements (Details Textual) $ in Millions	Dec. 20, 2011	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 15, 2018
Debt Securities, Available-for-sale, Total		$ 19.5
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		17.2	15.6
Accounts Payable and Accrued Liabilities [Member]
Business Combination, Contingent Consideration, Liability, Current		0.8	0.9
Other Noncurrent Liabilities [Member]
Business Combination, Contingent Consideration, Liability, Noncurrent		$ 0.7	$ 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		0.061	0.062

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Percentage of EBITDA to be paid to option holder as part of a business combination contingent consideration agreement.

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