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Note A - The Company and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Notes Tables |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | December 31, |
|  | 201 9 |  |  | 201 8 |
Accounts receivable - current |  | $ | 139,785 |  |  | $ | 1,587,817 |
Accounts receivable - non current |  |  | 1,720,000 |  |  |  | 1,720,000 |
|  |  | 1,859,785 |  |  |  | 3,307,817 |
Allowance for doubtful accounts - current |  |  | (13,785 | ) |  |  | (13,785 | )
Allowance for doubtful accounts - non current |  |  | (1,720,000 | ) |  |  | (1,720,000 | )
|  |  | (1,733,785 | ) |  |  | (1,733,785 | )
Accounts receivable, net of allowances for doubtful accounts |  | $ | 126,000 |  |  | $ | 1,574,032 |
Summary of Valuation Allowance [Table Text Block] |
|  | Balance at Beginning of Year |  |  | Charged to Costs and Expenses |  |  | Deductions From Reserves |  |  | Balance at End of Year |
Year Ended December 31, 201 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts |  | $ | 1,733,785 |  |  | $ | - |  |  | $ | - |  |  | $ | 1,733,785 |
Year Ended December 31, 201 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts |  | $ | 1,013,785 |  |  | $ | 720,000 |  |  | $ | - |  |  | $ | 1,733,785 |
Useful Lives of Property Plan and Equipment [Table Text Block] |
|  | Years |
Equipment and leasehold improvements |  |  |  |  |
Equipment (years) |  | 3 | - | 5 |
Furniture and fixtures (years) |  | 3 | - | 5 |
Software (years) |  |  | 3 |  |
Leasehold improvements |  | life or lease term |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Year ended December 31, |
|  | 201 9 |  |  | 201 8 |
Selling, general and administrative |  | $ | 828,981 |  |  | $ | 855,125 |
Research, development and engineering |  |  | 118,739 |  |  |  | 125,099 |
|  | $ | 947,720 |  |  | $ | 980,224 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year ended December 31, |
|  | 201 9 |  |  | 201 8 |
Weighted average Risk free interest rate |  |  | 2.33 | % |  |  | 2.70 | %
Expected life of options (in years) |  |  | 4.50 |  |  |  | 4.50 |
Expected dividends |  |  | 0 | % |  |  | 0 | %
Weighted average Volatility of stock price |  |  | 84 | % |  |  | 143 | %
Accounting Standards Update and Change in Accounting Principle [Table Text Block] |
|  | As reported |  |  | Adoption of ASC |  |  | Balance |
|  | December 31, 2018 |  |  | 842 - increase (decrease) |  |  | January 1, 2019 |
Operating lease right-of-assets |  | $ | - |  |  | $ | 602,937 |  |  | $ | 602,937 |
Prepaid expenses and other |  | $ | 150,811 |  |  | $ | (12,595 | ) |  | $ | 138,216 |
Total assets |  | $ | 11,692,332 |  |  | $ | 590,342 |  |  | $ | 12,282,674 |
Operating lease liabilities, current portion |  | $ | - |  |  | $ | 135,519 |  |  | $ | 135,519 |
Operating lease liabilities, net of current portion |  | $ | - |  |  | $ | 454,823 |  |  | $ | 454,823 |
Total liabilities |  | $ | 1,226,110 |  |  | $ | 590,342 |  |  | $ | 1,816,452 |
Total liabilities and stockholders’ equity |  | $ | 11,692,332 |  |  | $ | 590,342 |  |  | $ | 12,282,674 |

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