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Note 17 - Segment Information: Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Sales, net (notes 1, 3, 9 and 11) |  |  | $ 9,157 | $ 10,005 | $ 10,400 | $ 11,340 | $ 12,333 | $ 12,505 | $ 12,866 | $ 12,520 | $ 13,575 | $ 12,955 | $ 13,428 | $ 12,323 | $ 40,903 | $ 50,224 | $ 52,281
Gross profit |  |  | 5,323 | 5,802 | 6,253 | 6,766 | 7,098 | 7,359 | 7,739 | 7,843 | 8,327 | 8,186 | 8,151 | 7,533 | 24,143 | 30,038 | 32,196
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,901 | 1,685 | 1,507
Research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 813 | 560 | 493
Litigation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,139 | 1,660 | 670
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,065 | 5,692 | 6,417
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,594 | 16,777 | 19,790
Dividend and interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,367 | 3,036 | 661
Income before provision for income taxes | $ 16,802 | $ 20,089 |  |  |  |  |  |  |  |  |  |  |  |  | 16,802 | 20,089 | 20,659
Provision for income taxes (note 7) | $ 2,928 | $ 3,454 |  |  |  |  |  |  |  |  |  |  |  |  | 2,928 | 3,454 | 4,186
Net income |  |  | $ 2,902 | $ 3,563 | $ 3,453 | $ 3,956 | $ 4,287 | $ 3,935 | $ 4,200 | $ 4,214 | $ 4,555 | $ 4,280 | $ 4,103 | $ 3,534 | 13,874 | 16,635 | 16,473
Single Operating Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales, net (notes 1, 3, 9 and 11) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,903 | 50,224 | 52,281
Standard cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,406 | 17,400 | 16,939
Other cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,353 | 2,786 | 3,146
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,143 | $ 30,038 | $ 32,196
Gross Profit Margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 59.00% | 59.80% | 61.60%
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,901 | $ 1,685 | $ 1,507
Research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 813 | 560 | 493
Litigation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,139 | 1,660 | 670
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,030 | 5,661 | 6,386
Other Selling, General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,666 | 3,695 | 3,350
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,594 | $ 16,777 | $ 19,790
Operating Income Margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.20% | 33.40% | 37.90%
Dividend and interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,367 | $ 3,036 | $ 661
Other Operating Income (Expense), Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (159) | 276 | 209
Income before provision for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,802 | 20,089 | 20,659
Provision for income taxes (note 7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,928 | 3,454 | 4,186
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,874 | $ 16,635 | $ 16,473

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