Quarterly report pursuant to Section 13 or 15(d)

Note 2 - Summary of Significant Accounting Policies - Noncash Stock-based Compensation Expense (Details)

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Note 2 - Summary of Significant Accounting Policies - Noncash Stock-based Compensation Expense (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-Based Payment Arrangement, Expense $ 643,000 $ 1,185,000 $ 2,175,000 $ 3,284,000
Selling and Marketing Expense [Member]        
Share-Based Payment Arrangement, Expense 231,000 295,000 631,000 776,000
Research and Development Expense [Member]        
Share-Based Payment Arrangement, Expense 14,000 114,000 205,000 377,000
General and Administrative Expense [Member]        
Share-Based Payment Arrangement, Expense $ 398,000 $ 776,000 $ 1,339,000 $ 2,131,000