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Fair value (Tables)
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
The following table presents the Company’s fair value hierarchy for assets and liabilities measured at fair value as of March 31, 2019 and December 31, 2018.
 
 
 
March 31, 2019
 
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net asset arising from put/call options
 
$
-
 
 
$
-
 
 
$
-
 
 
$
-
 
 
 
 
December 31, 2018
 
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
Total
 
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Recurring
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net asset arising from put/call options
 
$
-
 
 
$
-
 
 
$
24,000
 
 
$
24,000
 
Fair Value Measurements, Nonrecurring [Table Text Block]
The activity for the Level 3 asset for the three months ended March 31, 2019:
 
Net asset arising from put/call options
 
 
 
 
Balance as of December 31, 2018
(1)
 
$
24,000
 
Unrealized loss
 
 
(24,000
)
Balance as of March 31, 2019
(1)
 
$
-
 
 
(1)
The net asset arising from the put/call options is included in other assets in the accompanying condensed consolidated balance sheets as of December 31, 2018.