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Note E - Concentration of Risk (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Cash, Uninsured Amount | $ 0 | $ 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Concentration Risk, Number of Major Customers | 2 | 3
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer A [Member] |  |
Concentration Risk, Percentage | 22.00% | 27.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer B [Member] |  |
Concentration Risk, Percentage | 14.00% | 14.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer C [Member] |  |
Concentration Risk, Percentage |  | 13.00%
Customer Concentration Risk [Member] | Non-current Accounts Receivable [Member] |  |
Concentration Risk, Number of Major Customers | 3 | 1
Concentration Risk, Percentage |  | 70.00%
Customer Concentration Risk [Member] | Non-current Accounts Receivable [Member] | Customer A [Member] |  |
Concentration Risk, Percentage | 18.00% |
Customer Concentration Risk [Member] | Non-current Accounts Receivable [Member] | Customer B [Member] |  |
Concentration Risk, Percentage | 16.00% |
Customer Concentration Risk [Member] | Non-current Accounts Receivable [Member] | Customer C [Member] |  |
Concentration Risk, Percentage | 14.00% |

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- Definition Represents the number of external customers that accounts for 10 percent or more of an entity's revenues or accounts receivable. + References No definition available. + Details
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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