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Note A - The Company and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] |
|  | December 31, |
|  | 201 8 |  |  | 201 7 |
Accounts receivable - current |  | $ | 1,587,817 |  |  | $ | 2,889,731 |
Accounts receivable - non current |  |  | 1,720,000 |  |  |  | 1,760,000 |
|  |  | 3,307,817 |  |  |  | 4,649,731 |
Allowance for doubtful accounts - current |  |  | (13,785 | ) |  |  | (13,785 | )
Allowance for doubtful accounts - non current |  |  | (1,720,000 | ) |  |  | (1,000,000 | )
|  |  | (1,733,785 | ) |  |  | (1,013,785 | )
Accounts receivable, net of allowances for doubtful accounts |  | $ | 1,574,032 |  |  | $ | 3,635,946 |
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 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts |  | $ | 1,013,785 |  |  | $ | 720,000 |  |  | $ | - |  |  | $ | 1,733,785 |
Year Ended December 31, 201 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts |  | $ | 513,785 |  |  | $ | 500,000 |  |  | $ | - |  |  | $ | 1,013,785 |
Useful Lives of Property Plan and Equipment [Table Text Block] | <div style="display: inline; font-family: times new roman; font-size: 10pt"><table cellpadding="0pt" cellspacing="0pt" style="text-indent: 0px; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin: 0pt; min-; min-width: 700px;"> <tr style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <td style="vertical-align: bottom; width: 84.8%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td style="vertical-align: bottom; width: 0.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td colspan="3" style="vertical-align: bottom; border-bottom: 1px solid rgb(0, 0, 0); width: 13.8%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">Years</div> </td> <td style="vertical-align: bottom; width: 0.5%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> </tr> <tr style="background-color: rgb(204, 238, 255); font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <td style="vertical-align: bottom; width: 84.8%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><div style="display: inline; font-style: italic;">Equipment and leasehold improvements</div></div> </td> <td style="vertical-align: bottom; width: 0.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td style="vertical-align: bottom; width: 5.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><div style="display: inline; font-style: italic;"> </div></div> </td> <td style="vertical-align: bottom; width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><div style="display: inline; font-style: italic;"> </div></div> </td> <td style="vertical-align: bottom; width: 6.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td style="vertical-align: bottom; width: 0.5%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"><div style="display: inline; font-style: italic;"> </div></div> </td> </tr> <tr style="background-color: rgb(255, 255, 255); font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <td style="vertical-align: bottom; width: 84.8%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Equipment (years)</div> </td> <td style="vertical-align: bottom; width: 0.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td style="vertical-align: bottom; width: 5.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:right;">3</div> </td> <td style="vertical-align: bottom; width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">-</div> </td> <td style="vertical-align: bottom; width: 6.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">5</div> </td> <td style="vertical-align: bottom; width: 0.5%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> </tr> <tr style="background-color: rgb(204, 238, 255); font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <td style="vertical-align: bottom; width: 84.8%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Furniture and fixtures (years)</div> </td> <td style="vertical-align: bottom; width: 0.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td style="vertical-align: bottom; width: 5.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:right;">3</div> </td> <td style="vertical-align: bottom; width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">-</div> </td> <td style="vertical-align: bottom; width: 6.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">5</div> </td> <td style="vertical-align: bottom; width: 0.5%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> </tr> <tr style="background-color: rgb(255, 255, 255); font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <td style="vertical-align: bottom; width: 84.8%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Software (years)</div> </td> <td style="vertical-align: bottom; width: 0.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td style="vertical-align: bottom; width: 5.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td style="vertical-align: bottom; width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">3</div> </td> <td style="vertical-align: bottom; width: 6.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:right;"> </div> </td> <td style="vertical-align: bottom; width: 0.5%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> </tr> <tr style="background-color: rgb(204, 238, 255); font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <td style="vertical-align: bottom; width: 84.8%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;">Leasehold improvements</div> </td> <td style="vertical-align: bottom; width: 0.9%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> <td colspan="3" style="vertical-align: bottom; width: 13.8%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"><div style="display: inline; font-style: italic; font-weight: inherit; font-style: normal;"> </div></div></div><div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:center;">life or lease term</div> </td> <td style="vertical-align: bottom; width: 0.5%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <div style=" font-family:'Times New Roman', Times, serif;font-size:10pt;margin:0pt;text-align:left;"> </div> </td> </tr> </table></div>
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
|  | Year ended December 31, |
|  | 201 8 |  |  | 201 7 |
Selling, general and administrative |  | $ | 855,125 |  |  | $ | 864,036 |
Research, development and engineering |  |  | 125,099 |  |  |  | 108,728 |
|  | $ | 980,224 |  |  | $ | 972,764 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year ended December 31, |
|  | 201 8 |  |  | 201 7 |
Weighted average Risk free interest rate |  |  | 2.70 | % |  |  | 1.92 | %
Expected life of options (in years) |  |  | 4.50 |  |  |  | 4.51 |
Expected dividends |  |  | 0 | % |  |  | 0 | %
Weighted average Volatility of stock price |  |  | 143 | % |  |  | 138 | %

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