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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Noncash stock compensation expense $ 636,000 $ 470,000 $ 1,609,000 $ 1,570,000
Selling and Marketing Expense [Member]        
Noncash stock compensation expense 289,000 272,000 708,000 668,000
Research and Development Expense [Member]        
Noncash stock compensation expense 41,000 51,000 98,000 199,000
General and Administrative Expense [Member]        
Noncash stock compensation expense $ 306,000 $ 147,000 $ 803,000 $ 703,000