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Note N - Income Taxes (Details Textual) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards, Valuation Allowance, Total |  | $ 0 | $ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 34.00%
Deferred Tax Assets Gross, Increase (Decrease) Due to New Tax Cuts and Jobs Act 2017 |  |  | $ (8,677,000)
Percentage of Valuation Allowance |  | 100.00% |
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount |  | $ 24,000 | 19,000
Unrecognized Tax Benefits, Ending Balance |  | 0 | 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total |  | 0 | 0
Tax Year 2015 [Member] |  |  |
Open Tax Year | 2015 |  |
Tax Year 2016 [Member] |  |  |
Open Tax Year | 2016 |  |
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards, Total |  | 65,300,000 | 60,000,000
State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards, Total |  | $ 30,800,000 | $ 26,000,000

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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