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Note 10 - Significant Customers - Concentration Risk by Risk Factor of Sales Revenue and Accounts Receivable (Details) - Customer Concentration Risk [Member] | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Sales Revenue, Net [Member] |  |  |
Concentration risk, percentage |  |  | 16.10%
Sales Revenue, Net [Member] | Customer A [Member] |  |  |
Concentration risk, percentage |  | [1] | 16.10%
Accounts Receivable [Member] |  |  |
Concentration risk, percentage | 26.30% |  | 31.30%
Accounts Receivable [Member] | Customer A [Member] |  |  |
Concentration risk, percentage |  | [1] | 20.30%
Accounts Receivable [Member] | Customer B [Member] |  |  |
Concentration risk, percentage | 14.50% |  | 11.00%
Accounts Receivable [Member] | Customer C [Member] |  |  |
Concentration risk, percentage | 11.80% |  |
[1] | Sales to Customer A (Starin Marketing) in 2018 did not exceed 10% of the revenue. Customer A ceased to be a ClearOne distributor in 2018.

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