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Fair Value of Financial Instruments
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
The Company owns marketable securities that are solely classified as trading securities as of December 31, 2018. There were no transfers of assets between levels within the fair value hierarchy. The following table summarizes the fair value of these marketable securities by level within the fair value hierarchy:
December 31, 2018December 31, 2017
Level 1Level 2TotalLevel 1Level 2Total
U.S. Treasury notes and bonds$5,034,955 $— $5,034,955 $— $— $— 
U.S. Agency issued mortgage-backed securities - variable rate— — — — 3,539,102 3,539,102 
U.S. Agency notes and bonds - fixed rate— — — — 198,293 198,293 
Corporate bonds— 2,504,551 2,504,551 
SBA loan pools - variable rate— — — — 935,081 935,081 
Short-term cash investments— 751,173 751,173 — — — 
Total fair value of marketable securities$5,034,955 $3,255,724 $8,290,679 $— $4,672,476 $4,672,476 
The fair values of all other financial instruments outstanding as of December 31, 2018 and 2017 approximate their carrying values. There were no changes to the valuation techniques for the Level 2 marketable securities during 2018 or 2017.