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Note 12 - Fair Value Measurements (Details Textual) $ in Thousands	Dec. 20, 2011	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 15, 2018
Debt Securities, Available-for-sale, Amortized Cost, Total		$ 19,000
Debt Security Interest Rate Stated Percentage		7.50%
Debt Securities, Available-for-sale, Current, Total		$ 600	$ 600
Debt Securities, Available-for-sale, Noncurrent		16,100	15,600
Debt Security, Available-For-Sale, Fair Value Discount Amount		2,500	2,700
Business Combination Contingent Consideration Arrangements, Payment To Option Holder Percentage Of Ebitda	1.00%
Business Combination Contingent Consideration, Period of Monthly Payments	10.00%
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		600	600
Other Noncurrent Assets [Member]
Debt Securities, Available-for-sale, Noncurrent		16,100	15,600
Accounts Payable and Accrued Liabilities [Member]
Business Combination, Contingent Consideration, Liability, Current		900	900
Other Noncurrent Liabilities [Member]
Business Combination, Contingent Consideration, Liability, Noncurrent		$ 0	$ 800
Measurement Input, Discount Rate [Member]
Debt Securities, Available-for-sale, Measurement Input		0.096	0.105
Business Combination, Contingent Consideration, Liability, Measurement Input		0.061	0.062

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- Definition

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

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