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STOCKHOLDERS’ EQUITY (Narrative) (Details) - USD ($)	3 Months Ended						9 Months Ended	12 Months Ended
STOCKHOLDERS’ EQUITY (Narrative) (Details) - USD ($)	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Common stock issued	66,476,020						66,476,020	60,609,102
Common stock outstanding	64,690,075						64,690,075	60,609,102
Repurchase of common stock, shares							1,785,945
Repurchase of common stock, value	$ 9,103,962	$ 4,897,976	$ 3,647,076				$ 17,649,014
Exercise of options, value	646,164	690,267	215,726	$ 876,637	$ 608,902	$ 264,357
Stock issued for services, value	11,110,371	10,233,913	$ 6,210,293	$ 7,099,352	$ 5,277,346	$ 2,370,004
Unrecognized compensation expense - stock awards	19,807,201						19,807,201
Unrecognized compensation expense - options	$ 8,747,985						$ 8,747,985
Restricted stock, incentive program	1,790,622						1,790,622
2013 Stock Options and 2015 Equity Incentive Plan [Member] \| Agents and Brokers [Member]
Stock issued for services, shares			620,287		373,573	208,324
Stock issued for services, value		$ 10,233,913	$ 6,210,293		$ 5,277,346	$ 2,370,004
Stock options granted, shares		935,177
2015 Agent Equity Program
Percentage of commission potentially redeemed in common stock							5.00%
Percentage of discount of market price, date of issuance							20.00%
Share based compensation plan description							The Company provides agents and brokers the opportunity to elect to receive 5% of commissions earned from each completed residential real estate transaction in the form of common stock. The shares are issued at a 20% discount to market on the date of issuance. The issued shares have no future service requirement. We recognize this 20% discount as an additional commissions and other agent-related costs.
Unrecognized compensation expense - recognition period							1 year 8 months 23 days
2015 Agent Equity Program \| Agents and Brokers [Member]
Stock issued for services, shares	1,252,540			407,201
Stock issued for services, value	$ 11,110,370			$ 7,099,352
Stock Options
Exercise of options, shares							1,895,629	2,594,050
Unrecognized compensation expense - recognition period							5 years
Stock options granted, shares	131,201	103,632	109,040				343,873	870,000
Stock options granted fair value	$ 1,092,044	$ 997,141	$ 1,039,427
Restricted Stock
Restricted stock, incentive program	3,178,410						3,178,410	3,872,877	3,059,065