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Note 10 - Fair Value of Financial Instruments | 3 Months Ended
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Mar. 31, 2022
Notes to Financial Statements |
Fair Value Disclosures [Text Block] | Note 10. Fair Value of Financial Instruments​ ​ The following table represents a summary of the Company’s financial instruments measured at fair value on a recurring basis for the periods indicated (in thousands): ​
|  | As of March 31, 2022 |  |  | As of December 31, 2021 |
​ |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash and cash equivalents |  | $ | 31,980 |  |  | $ | — |  |  | $ | — |  |  | $ | 31,980 |  |  | $ | 34,656 |  |  | $ | — |  |  | $ | — |  |  | $ | 34,656 |
Restricted cash |  |  | 8,128 |  |  |  | — |  |  |  | — |  |  | $ | 8,128 |  |  |  | 6,480 |  |  |  | — |  |  |  | — |  |  | $ | 6,480 |
Note receivable |  |  | — |  |  |  | 1,195 |  |  |  | — |  |  |  | 1,195 |  |  |  | — |  |  |  | 8,148 |  |  |  | — |  |  |  | 8,148 |
Total assets |  | $ | 40,108 |  |  | $ | 1,195 |  |  | $ | — |  |  | $ | 41,303 |  |  | $ | 41,136 |  |  | $ | 8,148 |  |  | $ | — |  |  | $ | 49,284 |
Liabilities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Bank acceptance payable |  | $ | — |  |  | $ | 9,955 |  |  | $ | — |  |  | $ | 9,955 |  |  | $ | — |  |  | $ | 8,198 |  |  | $ | — |  |  |  | 8,198 |
Convertible senior notes |  |  | — |  |  |  | 68,667 |  |  |  | — |  |  |  | 68,667 |  |  |  | — |  |  |  | 67,588 |  |  |  | — |  |  |  | 67,588 |
Total liabilities |  | $ | — |  |  | $ | 78,622 |  |  | $ | — |  |  | $ | 78,622 |  |  | $ | — |  |  | $ | 75,786 |  |  | $ | — |  |  | $ | 75,786 |
​ The carrying value amounts of accounts receivable, prepaid expenses and other current assets, accounts payable, accrued expenses and other current liabilities approximate fair value because of the short-term maturity of these instruments. The carrying value amounts of note receivable and bank acceptances approximate fair value due to the short-term nature of the debt since it renews frequently at current interest rates. The Company believes that the interest rates in effect at each period end represent the current market rates for similar borrowings. The fair value of its convertible senior debt is measured for disclosure purpose. The fair value is based on observable market prices for this debt, which is traded in less active markets and are therefore classified as a Level 2 fair value measurement. ​

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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