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Note 5 - Concentration of Credit Risk (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021
Cash, FDIC Insured Amount |  | $ 250 |
Number Of Banks | 7 | 5 |
Cash Balances On Deposit FDIC Insured Amount | $ 171,800 | $ 36,000 |
Cash Deposit with Foreign Banks | $ 129,200 | $ 74,900 |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |
Number of Customers | 50 | 50 | 50
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top Fifty Customers [Member] |  |  |
Concentration Risk, Percentage | 45.00% | 41.00% | 38.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Individual Customer [Member] |  |  |
Number of Customers | 0 | 0 | 0
Concentration Risk, Percentage | 3.00% | 3.00% | 3.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Individual Customer [Member] |  |  |
Number of Customers | 0 | 0 |
Concentration Risk, Percentage | 5.00% | 6.00% |

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- Definition The amount of cash deposited in financial institutions as of the balance sheet date that is 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 -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-21 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-20 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-18 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482861/275-10-50-20 + Details
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- Definition Represents amount of cash balances on deposit for FDIC insured. + References No definition available. + Details
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