Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Narrative) (Details)

v3.19.3.a.u2
Fair Value Measurements (Narrative) (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Fair Value Measurements [Abstract]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0 $ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0 0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount $ 0 $ 0