Note 2 - Revenue (Details Textual) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Revenue from Contract with Customers, Sales Returns, Percent | 1.00% | 2.00% |
| Contract with Customer, Liability, Revenue Recognized | $ 1.4 | |
| Minimum [Member] | ||
| Revenue from Contract with Customer, Sales Returns Policy Term (Day) | 14 days | |
| Revenue from Contract with Customers, Historical Sales Returns, Percent | 1.00% | |
| Maximum [Member] | ||
| Revenue from Contract with Customer, Sales Returns Policy Term (Day) | 1 year | |
| Revenue from Contract with Customers, Historical Sales Returns, Percent | 10.00% | |
| X | ||||||||||
- Definition Represents the sales returns policy term. No definition available.
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| X | ||||||||||
- Definition Represents the percentage of historical sales returns. No definition available.
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| X | ||||||||||
- Definition Represents the percentage of sales returns. No definition available.
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| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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