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Note 2 - Concentration of Credit Risk and Major Customers (Details Textual) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Excess Cash Balances, Number of High Credit Quality Financial Institutions | 2 |
Concentration Risk, Number of Divisions | 2 | 2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Concentration Risk, Percentage | 20.00% | 20.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Division One of Largest Customer [Member] |  |
Concentration Risk, Percentage | 21.20% | 19.90%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Division Two of Largest Customer [Member] |  |
Concentration Risk, Percentage | 2.20% | 2.60%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Largest Customer [Member] |  |
Concentration Risk, Percentage | 23.40% | 22.50%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Largest Customer [Member] |  |
Concentration Risk, Percentage | 19.60% | 35.60%

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- Definition Represents the number of divisions related to concentration risk. + References No definition available. + Details
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- Definition Represents the number of high credit quality financial institution with whom excess cash balances are maintained for checking accounts. + 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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