Note 5 - Fair Value (Details Textual) - USD ($) |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Derivative Liability, Total | $ 63,000 | $ 63,000 | ||
| Fair Value, Inputs, Level 1 [Member] | ||||
| Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 | $ 0 | ||
| Fair Value, Inputs, Level 3 [Member] | ||||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease), Total | 0 | (140,000) | ||
| Fair Value, Inputs, Level 2 [Member] | ||||
| Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 | $ 0 | ||
| Other Liabilities [Member] | ||||
| Derivative Liability, Total | $ 63,000 | $ 63,000 | ||
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Fair value of financial and nonfinancial obligations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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