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Note 3 - Fair Value Measurement - Fair Value of Assets Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and Cash Equivalents, Fair Value | $ 12,872 | $ 21,407
Cash and Cash Equivalents, Fair Value | (12,872) | (21,407)
Money Market Funds [Member] |  |
Cash and Cash Equivalents, Fair Value | 12,917,000 | 20,662,000
Cash and Cash Equivalents, Fair Value | (12,917,000) | (20,662,000)
Demand Deposits [Member] |  |
Cash and Cash Equivalents, Fair Value | 45,000 | 745,000
Cash and Cash Equivalents, Fair Value | (45,000) | (745,000)
Fair Value, Inputs, Level 1 [Member] |  |
Cash and Cash Equivalents, Fair Value | 12,917 | 20,662
Cash and Cash Equivalents, Fair Value | (12,917) | (20,662)
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Cash and Cash Equivalents, Fair Value | 12,917,000 | 20,662,000
Cash and Cash Equivalents, Fair Value | (12,917,000) | (20,662,000)
Fair Value, Inputs, Level 1 [Member] | Demand Deposits [Member] |  |
Cash and Cash Equivalents, Fair Value | 0 | 0
Cash and Cash Equivalents, Fair Value | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Cash and Cash Equivalents, Fair Value | 0 | 0
Cash and Cash Equivalents, Fair Value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member] |  |
Cash and Cash Equivalents, Fair Value | 0 | 0
Cash and Cash Equivalents, Fair Value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Demand Deposits [Member] |  |
Cash and Cash Equivalents, Fair Value | 0 | 0
Cash and Cash Equivalents, Fair Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Cash and Cash Equivalents, Fair Value | 0 | 0
Cash and Cash Equivalents, Fair Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member] |  |
Cash and Cash Equivalents, Fair Value | 0 | 0
Cash and Cash Equivalents, Fair Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Demand Deposits [Member] |  |
Cash and Cash Equivalents, Fair Value | 0 | (0)
Cash and Cash Equivalents, Fair Value | $ 0 | $ 0

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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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