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Note A - The Company and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Balance at beginning of year | $ 1,013,785 | $ 513,785
Charges to costs and expenses | 720,000 | 500,000
Deductions from reserves |  |
Balance at end of year | $ 1,733,785 | $ 1,013,785

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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