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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Measurements  
Summary of valuation of financial instrument pricing levels

 

 

 

Total

 

  Level 1     

 

Level 2

 

Level 3

 

2017

 

 

 

 

 

 

 

 

 

Available-for-sale securities

 

$
344,000

 

$
344,000

 

$

—

 

$

—

 

 

 

 

 

 

 

 

 

 

 

2016

 

 

 

 

 

 

 

 

 

Available-for-sale securities

 

$
304,000

 

$
304,000

 

$

—

 

$

—