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Note J - Fair Value of Financial Instruments - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and cash equivalents | $ 34,656 | $ 43,425
Restricted cash | 6,480 | 6,689
Note receivable | 8,148 | 401
Total assets | 49,284 | 50,515
Bank acceptance payable | 8,198 | 15,860
Convertible senior notes | 67,588 | 70,225
Total liabilities | 75,786 | 86,085
Fair Value, Inputs, Level 1 [Member] |  |
Cash and cash equivalents | 34,656 | 43,425
Restricted cash | 6,480 | 6,689
Note receivable | 0 | 0
Total assets | 41,136 | 50,114
Bank acceptance payable | 0 | 0
Convertible senior notes | 0 | 0
Total liabilities | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Note receivable | 8,148 | 401
Total assets | 8,148 | 401
Bank acceptance payable | 8,198 | 15,860
Convertible senior notes | 67,588 | 70,225
Total liabilities | 75,786 | 86,085
Fair Value, Inputs, Level 3 [Member] |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Note receivable | 0 | 0
Total assets | 0 | 0
Bank acceptance payable | 0 | 0
Convertible senior notes | 0 | 0
Total liabilities | $ 0 | $ 0

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- Definition Fair value portion of restricted cash and cash equivalents. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Carrying amount as of the balance sheet date of drafts and bills of exchange that have been accepted by the reporting bank, or by others for its own account, as its liability to holders of the drafts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.14) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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