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, 2021
Dec. 31, 2020
Stock options $ 1,148,000 $ 745,000
Warrants 0 282,000
Restricted stock units 1,233,000 836,000
Other compensation expense 0 141,000
Total noncash stock compensation expense 2,381,000 2,004,000
Total noncash stock compensation expense 2,381,000 2,004,000
Selling and Marketing Expense [Member]    
Total noncash stock compensation expense 934,000 849,000
Total noncash stock compensation expense 934,000 849,000
Research and Development Expense [Member]    
Total noncash stock compensation expense 288,000 254,000
Total noncash stock compensation expense 288,000 254,000
General and Administrative Expense [Member]    
Total noncash stock compensation expense 1,159,000 901,000
Total noncash stock compensation expense $ 1,159,000 $ 901,000