XML 31 R21.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 5 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
        Fair Value Measurements at Reporting Date Using
    March 31, 2018   Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
  Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Cash equivalents:                                
Money market funds   $
6,504
    $
6,504
    $
-
    $
-
 
Bank certificates of deposit    
2,750
     
-
     
2,750
     
-
 
Total cash equivalents   $
9,254
    $
6,504
    $
2,750
    $
-
 
                                 
Investments:                                
Bank certificates of deposit   $
21,250
    $
-
    $
21,250
    $
-
 
        Fair Value Measurements at Reporting Date Using
 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
Quoted Prices in
Active Markets
for Identical Assets
(Level 1)
 
 
 
 
 Significant Other
Observable Inputs
(Level 2)
 
 
 
 
 
Significant
Unobservable
Inputs
(Level 3)
Cash equivalents:                                
Money market funds   $
5,893
    $
5,893
    $
-
    $
-
 
Bank certificates of deposit    
500
     
-
     
500
     
-
 
Total cash equivalents   $
6,393
    $
5,893
    $
500
    $
-
 
                                 
Investments:                                
Bank certificates of deposit   $
24,000
    $
-
    $
24,000
    $
-