Annual report pursuant to Section 13 and 15(d)

Note 8 - Stock-based Incentive Plans - Noncash Stock-based Compensation Expense (Details)

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Note 8 - Stock-based Incentive Plans - Noncash Stock-based Compensation Expense (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Stock options $ 1,014,000 $ 1,278,000
Total noncash stock compensation expense 2,735,000 4,263,000
Warrants 228,000 20,000
Restricted stock units 1,493,000 2,965,000
Total noncash stock compensation expense 2,735,000 4,263,000
Selling and Marketing Expense [Member]    
Total noncash stock compensation expense 879,000 1,079,000
Total noncash stock compensation expense 879,000 1,079,000
Research and Development Expense [Member]    
Total noncash stock compensation expense 219,000 389,000
Total noncash stock compensation expense 219,000 389,000
General and Administrative Expense [Member]    
Total noncash stock compensation expense 1,637,000 2,795,000
Total noncash stock compensation expense $ 1,637,000 $ 2,795,000