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Note J - Stock Option Plans - Summary of Option Activity for Employees and Non-employees (Details) - USD ($) | 1 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Nov. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Number of options (in shares) |  | 1,670,221 | 1,670,221 | 1,985,335 |
Weighted average exercise price, outstanding (in dollars per share) |  | $ 1.71 | $ 1.71 | $ 1.74 |
Weighted average remaining contractual life, outstanding (Year) |  |  | 2 years | 2 years 146 days | 3 years 14 days
Aggregate intrinsic value, outstanding | $ 114,570 |  | $ 114,570 |  | $ 25,160
Number of options granted (in shares) | 592,358 | 592,358 |  |  |
Weighted average exercise price, granted (in dollars per share) |  |  |  |  |
Weighted average remaining contractual life, granted (Year) |  |  |  |  |
Number of options exercised (in shares) |  |  |  |  |
Weighted average exercise price, exercised (in dollars per share) |  |  |  |  |
Number of options forfeited and expired (in shares) |  |  | (457,779) | (315,114) |
Number of options exercisable (in shares) | 1,117,834 |  | 1,117,834 | 1,317,632 |
Weighted average exercise price, exercisable (in dollars per share) | $ 1.65 |  | $ 1.65 | $ 1.79 |
Weighted average remaining contractual life, exercisable (Year) |  |  | 1 year 328 days | 2 years 54 days |
Aggregate intrinsic value, exercisable | $ 88,982 |  | $ 88,982 |  |
Forfeited or expired (in dollars per share) |  |  | $ 1.96 |  |
Number of options exercised (in shares) |  |  |  |  |
Number of options (in shares) | 1,212,442 |  | 1,212,442 | 1,670,221 | 1,985,335
Weighted average exercise price, outstanding (in dollars per share) | $ 1.61 |  | $ 1.61 | $ 1.71 | $ 1.74
Non-employee Options [Member] |  |  |  |  |
Number of options (in shares) |  | 33,332 | 33,332 | 224,999 |
Weighted average exercise price, outstanding (in dollars per share) |  | $ 1.87 | $ 1.87 | $ 2.53 |
Weighted average remaining contractual life, outstanding (Year) |  |  | 2 years 343 days | 2 years 343 days | 4 years 116 days
Aggregate intrinsic value, outstanding | $ 19,333 |  | $ 19,333 |  |
Number of options granted (in shares) |  |  | 16,666 | 8,333 |
Weighted average exercise price, granted (in dollars per share) |  |  | $ 0.55 | $ 0.75 |
Weighted average remaining contractual life, granted (Year) |  |  | 4 years 156 days | 4 years 120 days |
Number of options exercised (in shares) |  |  |  |  |
Weighted average exercise price, exercised (in dollars per share) |  |  |  |  |
Number of options forfeited and expired (in shares) |  |  |  | (200,000) |
Number of options exercisable (in shares) | 36,109 |  | 36,109 | 27,777 |
Weighted average exercise price, exercisable (in dollars per share) | $ 1.76 |  | $ 1.76 | $ 2.10 |
Weighted average remaining contractual life, exercisable (Year) |  |  | 2 years 160 days | 2 years 240 days |
Aggregate intrinsic value, exercisable | $ 8,222 |  | $ 8,222 |  |
Forfeited or expired (in dollars per share) |  |  |  | $ 2.55 |
Number of options exercised (in shares) |  |  |  |  |
Aggregate intrinsic value, granted |  |  | $ 13,999 |  |
Number of options (in shares) | 49,998 |  | 49,998 | 33,332 | 224,999
Weighted average exercise price, outstanding (in dollars per share) | $ 1.43 |  | $ 1.43 | $ 1.87 | $ 2.53

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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