Stockholders' Equity (2011 Stock Option Plan) (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2011
Stock Option Plan 2005 [Member]
Stockholders' Equity (Textual)
Shares authorized for plan		1,000,000
Employee And Consultants [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares authorized for plan	16,000,000			2,000,000
Issuance of additional common stock	10,000,000
Senior officers [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			25,000
Stock option plan, expiration date			Dec. 31, 2026
Exercise price per unit			$ 0.01
Fair value of stock options granted			$ 34,000
Senior officer one [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			30,000
Stock option plan, expiration date			Oct. 02, 2027
Exercise price per unit			$ 0.01
Fair value of stock options granted			$ 101,000
Stock option vested, description		The options have vesting schedules of 10,000 shares on each of December 31, 2017, June 30, 2018 and June 30, 2019, respectively and are exercisable through October 2, 2027. The fair value of the options at the date of grant amounted to approximately $101,000. The cost recognized during 2017 amounted to approximately $50,000. The balance of $51,000 is expected to be recognized in 2018 and 2019.
Five Senior officers [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		110,000
Stock option plan, expiration date		Jan. 04, 2028
Exercise price per unit		$ 0.01
Fair value of stock options granted		$ 250,000
23 senior officers, staff members and consultants [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		330,000	1,555,000
Stock option plan, expiration date		Jan. 01, 2028	Jan. 01, 2027
Exercise price per unit		$ 0.01	$ 0.01
Fair value of stock options granted		$ 759,000	$ 2,116,000
23 senior officers, staff members and consultants [Member] | 2011 Plan [Member] | June 30, 2018 [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		165,000
23 senior officers, staff members and consultants [Member] | 2011 Plan [Member] | December 31, 2018 [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		165,000
Senior officer two [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			35,000
Stock option plan, expiration date			Jan. 04, 2027
Exercise price per unit			$ 0.01
Fair value of stock options granted			$ 48,000
Consultant [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			20,000
Stock option plan, expiration date			Jan. 11, 2027
Exercise price per unit			$ 0.01
Fair value of stock options granted			$ 27,000
One consultant [Member] | 2011 Plan [Member] | October 2, 2027 [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			10,000
Stock option plan, expiration date			Oct. 02, 2027
Exercise price per unit			$ 0.01
Fair value of stock options granted			$ 34,000
One consultant [Member] | 2011 Plan [Member] | December 31, 2027 [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			12,500
Stock option plan, expiration date			Dec. 31, 2017
Exercise price per unit			$ 0.01
Fair value of stock options granted			$ 31,000
Three Consultants [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		55,000
Exercise price per unit		$ 0.01
Fair value of stock options granted		$ 222,000
Stock option vested, description		The options are exercisable through March 1, 2028. However, the vesting and exercisability of these options is subject to the following schedule: (a) 27,500 options vest on June 30, 2018 and (b) the remaining 27,500 options vest on June 30, 2019.
One Staff Member[Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			10,000
Stock option plan, expiration date			Sep. 01, 2027
Exercise price per unit			$ 0.01
Fair value of stock options granted			$ 35,000
One Staff Member[Member] | 2011 Plan [Member] | September 01, 2027 [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		10,000
Stock option plan, expiration date		Sep. 01, 2028
Exercise price per unit		$ 0.01
Fair value of stock options granted		$ 18,000
Five staff [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			90,000
Stock option plan, expiration date			Apr. 17, 2027
Exercise price per unit			$ 0.01
Fair value of stock options granted			$ 104,000
Seven Staff Members [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		14,000
Stock option plan, expiration date		Apr. 05, 2028
Exercise price per unit		$ 0.01
Fair value of stock options granted		$ 62,000
Non-Employee Directors [Member] | 2011 Plan [Member]
Stockholders' Equity (Textual)
Shares authorized for plan				1,000,000
One New Board [Member] | 2011 Non-Employee Directors Stock Option Plan [Member] | July 2, 2024 [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		25,000
Stock option plan, expiration date		Jul. 02, 2024
Exercise price per unit		$ 4.15
Fair value of stock options granted		$ 55,000
One New Board [Member] | 2011 Non-Employee Directors Stock Option Plan [Member] | September 4, 2024 [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		25,000
Stock option plan, expiration date		Sep. 04, 2024
Exercise price per unit		$ 1.78
Fair value of stock options granted		$ 25,000
One New Board [Member] | 2011 Directors Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			25,000
Stock option plan, expiration date			May 01, 2023
Exercise price per unit			$ 1.33
Fair value of stock options granted			$ 10,000
Eight New Board [Member] | 2011 Non-Employee Directors Stock Option Plan [Member] | January 1, 2024 [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)		400,000
Stock option plan, expiration date		Jan. 01, 2024
Exercise price per unit		$ 2.31
Fair value of stock options granted		$ 428,000
Eight New Board [Member] | 2011 Directors Plan [Member]
Stockholders' Equity (Textual)
Shares purchased under option plan (in share)			400,000
Stock option plan, expiration date			Jun. 06, 2023
Exercise price per unit			$ 1.75
Fair value of stock options granted			$ 235,000