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Note 8 - Stock-based Incentive Plans - Noncash Stock-based Compensation Expense (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Stock options | $ 411,000 | $ 1,014,000
Total noncash stock compensation expense | 1,289,000 | 2,735,000
Warrants | 0 | 228,000
Restricted stock units | 878,000 | 1,493,000
Total noncash stock compensation expense | 1,289,000 | 2,735,000
Selling and Marketing Expense [Member] |  |
Total noncash stock compensation expense | 488,000 | 879,000
Total noncash stock compensation expense | 488,000 | 879,000
Research and Development Expense [Member] |  |
Total noncash stock compensation expense | 30,000 | 219,000
Total noncash stock compensation expense | 30,000 | 219,000
General and Administrative Expense [Member] |  |
Total noncash stock compensation expense | 771,000 | 1,637,000
Total noncash stock compensation expense | $ 771,000 | $ 1,637,000

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition Amount of noncash expense for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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