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Note 12 - Fair Value Measurements (Details Textual) $ in Millions	Dec. 20, 2011	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-Sale, Amortized Cost, Total		$ 17.8
Debt Security Interest Rate Stated Percentage		7.50%
Debt Securities, Available-for-Sale, Current		$ 0.7	$ 0.6
Debt Securities, Available-for-Sale, Noncurrent		13.0	15.2
Debt Security, Available-For-Sale, Fair Value Discount Amount		2.2	2.3
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		0.7	0.6
Other Noncurrent Assets [Member]
Debt Securities, Available-for-Sale, Noncurrent		$ 13.0	15.2
Accrued Liabilities 1 [Member]
Business Combination, Contingent Consideration, Liability, Current			$ 0.1
Measurement Input, Discount Rate [Member]
Debt Securities, Available-for-Sale, Measurement Input		0.124	0.101

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

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