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Note 5 - Concentration of Credit Risk (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019
Cash, FDIC Insured Amount | $ 250 | $ 250 |
Number Of Banks | 15 |  | 10
Cash Balances On Deposit FDIC Insured Amount | $ 40,300 | 92,800 |
Cash Deposit with Foreign Banks | $ 240,400 | $ 122,500 |
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 | 32.00% | 33.00% | 33.00%
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 | 4.00% | 2.00% |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&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=123594938&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=123594938&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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- Definition Represents amount of cash balances on deposit for FDIC insured. + References No definition available. + Details
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- Definition The number of banks the company has cash balances on deposit that exceeds the balance insured by the FDIC limit + References No definition available. + Details
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