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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-Based Payment Arrangement, Expense $ 298,000 $ 749,000 $ 630,000 $ 1,532,000
Selling and Marketing Expense [Member]        
Share-Based Payment Arrangement, Expense 132,000 236,000 254,000 400,000
Research and Development Expense [Member]        
Share-Based Payment Arrangement, Expense 6,000 102,000 17,000 191,000
General and Administrative Expense [Member]        
Share-Based Payment Arrangement, Expense $ 160,000 $ 411,000 $ 359,000 $ 941,000