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Note 11 - Fair Value Measurements (Details Textual) $ in Millions	Dec. 20, 2011	Dec. 31, 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 Securities, Available-for-sale, Current, Total		$ 0.6	$ 0.6
Debt Securities, Available-for-sale, Noncurrent		15.2	16.1
Debt Security, Available-For-Sale, Fair Value Discount Amount		2.3	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		15.2	16.1
Accrued Liabilities [Member]
Business Combination, Contingent Consideration, Liability, Current		$ 0.1	$ 0.9
Measurement Input, Discount Rate [Member]
Debt Securities, Available-for-sale, Measurement Input		0.101	0.096
Business Combination, Contingent Consideration, Liability, Measurement Input			0.061

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- Definition

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

+ References

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

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