Note 6 - Major Customers (Details Textual)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Number of Major Customers	0	0
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Texas Instruments Incorporated [Member]
Concentration Risk, Percentage		10.00%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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