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Note 5 - Fair Value Measurements | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Fair Value Disclosures [Text Block] | 5. FAIR VALUE MEASUREMENTS Investments by category included in cash equivalents at the end of each period were as follows (in thousands):
|  |  |  | December 31, 2020 |  |  | December 31, 2019 |
|  | Fair Value Level1 |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Adjusted Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Money market funds |  | Level 1 |  | $ | 21,042 |  |  | $ | — |  |  | $ | 21,042 |  |  | $ | 11,659 |  |  | $ | — |  |  | $ | 11,659 |
Time deposits |  | Level 2 |  |  | 5,458 |  |  |  | — |  |  |  | 5,458 |  |  |  | 13,544 |  |  |  | — |  |  |  | 13,544 |
Municipal debt securities |  | Level 2 |  |  | 30,280 |  |  |  | (5 | ) |  |  | 30,275 |  |  |  | 347 |  |  |  | — |  |  |  | 347 |
Corporate debt securities |  | Level 2 |  |  | 11,621 |  |  |  | (6 | ) |  |  | 11,615 |  |  |  | 56,784 |  |  |  | (19 | ) |  |  | 56,765 |
Total investments |  |  |  | $ | 68,401 |  |  | $ | (11 | ) |  | $ | 68,390 |  |  | $ | 82,334 |  |  | $ | (19 | ) |  | $ | 82,315 |
1 FASB Topic 820, Fair Value Measurements, establishes a fair value hierarchy that requires the use of observable market data, when available, and prioritizes the inputs to valuation techniques used to measure fair value in the following categories: Level 1: Quoted market prices in active markets for identical assets or liabilities. Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data. Level 3: Unobservable inputs that are not corroborated by market data.

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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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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