Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments - Additional Information (Details Textuals)

v3.19.1
Financial Instruments - Additional Information (Details Textuals) - USD ($)
Mar. 31, 2019
Mar. 31, 2018
Fair Value Disclosures [Abstract]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0 $ 0