Investment in Omnimetrix - Schedule of Payments of Dividends Accrued on Preferred Stock Payable (Details) (Parenthetical) - Omni Metrix Holdings, Inc. [Member] $ in Thousands	Mar. 31, 2019 USD ($)
Aggregate future dividends on preferred stock	$ 100
Five Quarters Each [Member]
Aggregate future dividends on preferred stock	$ 20