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, 2022
Dec. 31, 2021
Stock options $ 1,278,000 $ 1,148,000
Total noncash stock compensation expense 4,263,000 2,381,000
Warrants 20,000 0
Restricted stock units 2,965,000 1,233,000
Total noncash stock compensation expense 4,263,000 2,381,000
Selling and Marketing Expense [Member]    
Total noncash stock compensation expense 1,079,000 934,000
Total noncash stock compensation expense 1,079,000 934,000
Research and Development Expense [Member]    
Total noncash stock compensation expense 389,000 288,000
Total noncash stock compensation expense 389,000 288,000
General and Administrative Expense [Member]    
Total noncash stock compensation expense 2,795,000 1,159,000
Total noncash stock compensation expense $ 2,795,000 $ 1,159,000