Convertible Subordinated Notes Payable (Narrative) (Details) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 18, 2018	Mar. 23, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Converted accrued interest amount credited to common stock and additional paid-in capital				$ 600,000		$ 741,000
Unamortized discounts			$ 38,000	$ 173,000	$ 76,000	$ 262,000
Common Stock [Member]
Number of converted shares of Convertible Notes			0	1,875,963	0	2,313,976
Converted accrued interest amount credited to common stock and additional paid-in capital				$ 600,000		$ 741,000
Convertible Notes [Member]
Aggregate principal amount	$ 2,920,000	$ 2,920,000		$ 687,500,000		$ 687,500,000
Number of converted shares of Convertible Notes						2,313,976
Converted accrued interest amount credited to common stock and additional paid-in capital						$ 741,000
Unamortized discounts					$ 115,000	$ 142,000	$ 141,000
Term	4 years	4 years
Interest rate	6.00%	6.00%
Conversion price	$ 0.32	$ 0.32
Price per share	$ 0.30	$ 0.36
Discount with related closing costs		$ 137,000
Notes payable from related parties			$ 120,000		$ 120,000		$ 120,000
Beneficial conversion feature, intrinsic value		$ 350,000