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Note 2 - Summary of Significant Accounting Policies - Revision of Prior Period (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Product revenue, net $ 4,610   $ 3,662   $ 7,734 $ 6,935
Cost of goods sold 2,304   1,824   3,492 3,283
Sales and marketing 1,718   2,040   3,371 4,025
Net loss $ (2,036) $ (1,739) $ (2,155) $ (111) $ (3,775) $ (2,266)
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share) $ (1.27)   $ (1.43)   $ (2.21) $ (1.54)
Previously Reported [Member]            
Cost of goods sold     $ 1,495     $ 2,608
Sales and marketing     1,752     3,439
Net loss     $ (2,155)     $ (2,266)
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share)     $ (1.43)     $ (1.54)
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Selling Commissions [Member]            
Cost of goods sold     $ 0     $ 0
Sales and marketing     288     586
Net loss     $ 0     $ 0
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share)     $ 0     $ 0
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Fulfillment Fees [Member]            
Cost of goods sold     $ 329     $ 675
Sales and marketing     0     0
Net loss     $ 0     $ 0
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share)     $ 0     $ 0
Product [Member]            
Product revenue, net $ 4,599   $ 3,660   $ 7,716 $ 6,927
Product [Member] | Previously Reported [Member]            
Product revenue, net     3,043     5,666
Product [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Selling Commissions [Member]            
Product revenue, net     288     586
Product [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Fulfillment Fees [Member]            
Product revenue, net     $ 329     $ 675