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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Noncash stock compensation expense $ 1,000,000 $ 561,000 $ 2,099,000 $ 972,000
Selling and Marketing Expense [Member]        
Noncash stock compensation expense 251,000 237,000 481,000 420,000
Research and Development Expense [Member]        
Noncash stock compensation expense 74,000 24,000 263,000 57,000
General and Administrative Expense [Member]        
Noncash stock compensation expense $ 675,000 $ 300,000 $ 1,355,000 $ 495,000