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Note 1 - The Company and Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Restricted Cash, Total | $ 1,200 | $ 1,200 |  |
Proceeds from Dividends Received | 0 |  |  |
Payments for Advance to Affiliate |  |  | $ 600 |
Impairment, Long-Lived Asset, Held-for-Use, Total | $ 0 | 0 | 0 |
Number of Reporting Units | 1 |  |  |
Capitalized Contract Cost, Amortization Period (Year) | 5 years |  |  |
Advertising Expense | $ 2,100 | $ 1,600 | $ 1,500 |
Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |  |
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |  |
Preferred Stock [Member] |  |  |  |
Investments, Total |  |  |  | $ 2,500
Other than Temporary Impairment Losses, Investments, Total |  |  |  | $ 0

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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