Note 2 - Summary of Significant Accounting Policies - Revenue From Unaffiliated Customers by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Revenue	$ 5,479	$ 6,567
Asia Pacific [Member]
Revenue	2,732	2,349
North America [Member]
Revenue	2,537	3,672
CANADA
Revenue	110	277
Europe And Middle East [Member]
Revenue	86	254
Latin America [Member]
Revenue	$ 14	$ 15

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details