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Note 8 - Fair Value Measurements (Details Textual) $ in Millions	Dec. 20, 2011	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Amortized Cost, Total		$ 18.4
Debt Security Interest Rate Stated Percentage		7.50%
Debt Security, Available-For-Sale, Fair Value Discount Amount		$ 2.4	$ 2.5
Business Combination Contingent Consideration Arrangements, Payment To Option Holder Percentage Of Ebitda	1.00%
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		15.4	16.1
Accrued Liabilities [Member]
Business Combination, Contingent Consideration, Liability, Current		$ 0.3	$ 0.9
Measurement Input, Discount Rate [Member]
Debt Securities, Available-for-sale, Measurement Input		0.102	0.096
Business Combination, Contingent Consideration, Liability, Measurement Input		0.044	0.061

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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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