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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Financial assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):
 
Level 1
 
Level 2
 
Level 3
Assets as of March 31, 2019:
 
 
 
 
 
Trading securities - debt
$
—

 
$
93,756

 
$
—

Trading securities - equity
831

 
—

 
—

Investment at fair value - warrants (Note 5)
—

 
1,367

 
—

Investment at fair value - common stock (Note 5)
4,116

 
—

 
—

Total recurring fair value measurements as of March 31, 2019
$
4,947

 
$
95,123

 
$
—

 
 
 
 
 
 
Assets as of December 31, 2018:
 
 
 
 
 
Trading securities - debt
$
—

 
$
33,642

 
$
—

Trading securities - equity
3,012

 
—

 
—

Investment at fair value - warrants (Note 5)
—

 
2,064

 
—

Investment at fair value - common stock (Note 5)
5,395

 
—

 
—

Total recurring fair value measurements as of December 31, 2018
$
8,407

 
$
35,706

 
$
—

 
 
 
 
 
 
Liabilities as of March 31, 2019:
 
 
 
 
 
Profits interest units
$
—

 
$
591

 
$
—

Liabilities as of December 31, 2018:
 
 
 
 
 
Profits interest units
$
—

 
$
591

 
$
—

 
 
 
 
 
 
Marketable Securities [Table Text Block]
Short-term investments for the periods presented were comprised of the following (in thousands):
 
Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
Security Type
 
 
 
 
 
 
 
March 31, 2019:
 
 
 
 
 
 
 
Trading securities - debt
$
93,464

 
$
294

 
$
(2
)
 
$
93,756

Trading securities - equity
829

 
8

 
(6
)
 
831

 
$
94,293

 
$
302

 
$
(8
)
 
$
94,587

December 31, 2018:
 
 
 
 
 
 
 
Trading securities - debt
$
33,643

 
$
18

 
$
(19
)
 
$
33,642

Trading securities - equity
3,389

 
27

 
(404
)
 
3,012

 
$
37,032

 
$
45

 
$
(423
)
 
$
36,654