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Note 5 - Cash, Cash Equivalents and Restricted Cash | 6 Months Ended
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Jun. 30, 2025
Notes to Financial Statements |
Cash and Cash Equivalents Disclosure [Text Block] | Note 5. Cash, Cash Equivalents and Restricted Cash ​ The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the statement of financial position that sum to the total of the same such amounts in the statement of cash flows (in thousands):
|  | June 30, |  |  | December 31, |
​ |  | 2025 |  |  | 2024 |
Cash and cash equivalents |  | $ | 64,699 |  |  | $ | 67,428 |
Restricted cash |  |  | 22,496 |  |  |  | 11,705 |
Total cash, cash equivalents and restricted cash shown in the statement of cash flows |  | $ | 87,195 |  |  | $ | 79,133 |
​ Restricted cash includes guarantee deposits for customs duties, a China government subsidy fund, and deposits as collateral in order to secure bank acceptance notes issued to vendors. As of June 30, 2025 and December 31, 2024, there was $18.1 million and $8.5 million of restricted cash required for bank acceptance notes issued to vendors, respectively. In addition, as of June 30, 2025 and December 31, 2024, certificates of deposit associated with credit facilities with a bank in China were both $2.5 million. There were $0.9 million and $0.7 million guarantee deposits for customs duties as of June 30, 2025 and December 31, 2024, respectively. There was $0.8 million and $0 government subsidy fund as of June 30, 2025 and December 31, 2024, respectively. ​

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- Definition The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) 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. Generally, only investments maturing within three months from the date of acquisition qualify. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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