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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
Mar. 31, 2023
Mar. 31, 2022
Product revenue, net $ 3,124 $ 3,273
Product cost of goods sold 1,188 1,459
Sales and marketing 1,653 1,985
Net loss $ (1,739) $ (111)
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share) $ (0.85) $ (0.08)
Previously Reported [Member]    
Product cost of goods sold   $ 1,113
Sales and marketing   1,687
Net loss   $ (111)
Net loss per share attributable to common stockholders (basic and diluted) (in dollars per share)   $ (0.08)
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Selling Commissions [Member]    
Product cost of goods sold   $ 0
Sales and marketing   298
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]    
Product cost of goods sold   $ 346
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 $ 3,117 $ 3,267
Product [Member] | Previously Reported [Member]    
Product revenue, net   2,623
Product [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Selling Commissions [Member]    
Product revenue, net   298
Product [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Change in Accounting for Fulfillment Fees [Member]    
Product revenue, net   $ 346