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Note 2 - Summary of Significant Accounting Policies - Revision of Prior Period (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Product revenue, net $ 14,404 $ 10,204
Cost of goods sold 6,623 3,689
Sales and marketing 7,798 8,093
Net loss $ (10,608) $ (5,824)
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share) $ (10.10) $ (5.26)
Previously Reported [Member]    
Cost of goods sold   $ 2,776
Sales and marketing   7,223
Net loss   $ (5,824)
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share)   $ (5.26)
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Selling Commissions [Member]    
Cost of goods sold   $ 0
Sales and marketing   870
Net loss   $ 0
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share)   $ 0
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Fulfillment Fees [Member]    
Cost of goods sold   $ 913
Sales and marketing   0
Net loss   $ 0
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share)   $ 0
Product [Member]    
Product revenue, net $ 14,374 $ 10,180
Cost of goods sold   3,689
Product [Member] | Previously Reported [Member]    
Product revenue, net   8,397
Product [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Selling Commissions [Member]    
Product revenue, net   870
Product [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Fulfillment Fees [Member]    
Product revenue, net   $ 913