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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%

X

- 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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X

- 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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X

- 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

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- Details

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- Details

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