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Note 4 - Fair Value Measurements
3 Months Ended
Mar. 31, 2019
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
4.
Fair Value Measurements
 
Financial instruments recorded at fair value in the consolidated balance sheets, or disclosed at fair value in the footnotes, are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels defined by ASC
820,
Fair Value Measurements and Disclosures, and directly related to the amount of subjectivity associated with inputs to fair valuation of these assets and liabilities, are as follows:
 
Level
1
Quoted prices in active markets for identical assets or liabilities.
Level
2
Inputs other than Level
1
that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities or other inputs that are observable or can be corroborated by observable market data
Level
3
Unobservable inputs that are supported by little or
no
market activity and that are significant to the fair value
 
The following table presents the fair value for financial instruments:
 
    Fair Value Measurements Using
    Level 1   Level 2   Level 3
             
As of March 31, 2019                        
Marketable securities (CD)   $
-
    $
3,912
    $
-
 
                         
As of December 31, 2018                        
Marketable securities (CD)   $
-
    $
3,905
    $
-
 
 
Fair values of marketable securities approximate cost due to the short period of time to maturity.