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NOTE 1 — Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Activities in allowance for doubtful accounts |
Year |  | Balance at Beginning of Year |  | Charged to Costs and Expenses |  | Amounts Written Off |  | Balance at End of Year
| 2021 |  |  | $ | 40,651 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,651 |
| 2020 |  |  | $ | 40,651 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,651 |
Inventory Components |
|  | December 31,
|  | 2021 |  | 2020
Raw materials and sub-assemblies |  | $ | 5,757,869 |  |  | $ | 3,642,377 |
Finished goods |  |  | 277,598 |  |  |  | 281,104 |
Inventory reserves |  |  | (880,943 | ) |  |  | (727,639 | )
Inventory, net |  | $ | 5,154,524 |  |  | $ | 3,195,842 |
Prepaid Expenses and Other Current Assets |
|  | December 31,
|  | 2021 |  | 2020
Prepaid insurance |  | $ | 94,923 |  |  | $ | 82,296 |
Product certification costs |  |  | 61,557 |  |  |  | 75,592 |
Prepaid inventory purchases |  |  | 131,635 |  |  |  | 93,859 |
Prepaid maintenance contracts and other prepaid expenses |  |  | 107,046 |  |  |  | 83,639 |
Prepaid expenses and other current assets |  | $ | 395,161 |  |  | $ | 335,386 |
Concentration of Credit Risk |
|  | December 31,
|  | 2021 |  | 2020
Ingram Micro, Inc. |  |  | 28 | % |  |  | 34 | %
ScanSource, Inc. |  |  | 24 | % |  |  | 13 | %
BlueStar, Inc. |  |  | 21 | % |  |  | 29 | %
Bluestar Europe Distribution BV |  |  | — | * |  |  | 11 | %
Warranty |
Year |  | Balance at Beginning of Year |  | Additional Warranty Reserves |  | Amounts Charged to Reserves |  | Balance at End of Year
| 2021 |  |  | $ | 78,871 |  |  | $ | 13,910 |  |  | $ | (13,910 | ) |  | $ | 78,871 |
| 2020 |  |  | $ | 78,871 |  |  | $ | 73,734 |  |  | $ | (73,734 | ) |  | $ | 78,871 |
Net Income (Loss) per Share Applicable to Common Stockholders |
|  | Years Ended December 31,
|  | 2021 |  | 2020
Numerator: |  |  |  |
Net income (loss) |  | $ | 4,466,257 |  |  | $ | (3,278,601 | )
Net income (loss) allocated to restricted stock award |  |  | (380,547 | ) |  |  | 188,375 |
Adjusted net income (loss) for basic earnings per share |  | $ | 4,085,710 |  |  | $ | (3,090,223 | )
Convertible note interest |  |  | 175,876 |  |  |  | — |
Adjusted net income (loss) before interest for diluted earnings per share |  | $ | 4,261,586 |  |  | $ | (2,571,114 | )
Denominator: Weighted average shares outstanding used in computing net income (loss) per share: |  |  |  |  |  |  |  |
Basic |  |  | 6,991,194 |  |  |  | 6,036,310 |
Fully diluted |  |  | 8,923,487 |  |  |  | 6,036,310 |
Net income (loss) per share applicable to common stockholders: |  |  |  |  |  |  |  |
Basic |  | $ | 0.58 |  |  | $ | (0.51 | )
Fully diluted |  | $ | 0.48 |  |  | $ | (0.51 | )
Revenues for geographic areas (in $'000) |
|  | Years Ended December 31,
Revenues: (in thousands) |  | 2021 |  | 2020
United States |  | $ | 17,455 |  |  | $ | 12,137 |
Europe |  |  | 3,493 |  |  |  | 2,209 |
Asia and rest of world |  |  | 2,251 |  |  |  | 1,354 |
Total |  | $ | 23,199 |  |  | $ | 15,700 |
Customers who accounted for at least 10% of total revenues |
|  | Years Ended December 31,
|  | 2021 |  | 2020
Ingram Micro, Inc. |  |  | 30 | % |  |  | 31 | %
BlueStar, Inc. |  |  | 23 | % |  |  | 23 | %
ScanSource, Inc. |  |  | 11 | % |  |  | — | *
* | Customer accounted for less than 10% of the Company’s total revenues |

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