Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Equivalents, at Carrying Value, Total	$ 0	$ 0
Cash, Uninsured Amount	4,700
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 47,900
Treasury Stock, Shares, Acquired	0	0	0
Research and Development Expense, Total	$ 9,500	$ 10,500	$ 5,000
Selling, General and Administrative Expense, Total	29,251	27,654	23,724
Reclassification of Material Overcharge Settlement to Selling, General and Administrative Expenses [Member]
Selling, General and Administrative Expense, Total		(104)	(121)
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense, Tax Benefit	$ 653	$ 544	$ 525
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Number of shares that have been repurchased during the period and are being held in treasury.

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