SHAREHOLDERS' EQUITY - Stock option activity (Details)	6 Months Ended
	Jun. 30, 2024 $ / shares shares	Jun. 30, 2023 $ / shares shares
Number of Stock Options
Outstanding, beginning of period	4,725,000	4,160,000
Granted	0	1,020,000
Exercised	(50,000)	(100,000)
Cancelled/Forfeited/Expired	(270,000)
Outstanding, end of period	4,405,000	5,080,000
Exercisable, end of period	4,363,333	3,726,250
Non-vested, end of period	41,667	1,353,750
Common shares issued on a net settlement basis	36,275
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 1.18	$ 1.26
Granted (in dollars per share) | $ / shares	0	0.38
Exercised (in dollars per share) | $ / shares	0.07	0.07
Cancelled/Forfeited/Expired (in dollars per share) | $ / shares	0.42
Outstanding, end of period (in dollars per share) | $ / shares	1.24	1.10
Exercisable, end of period (in dollars per share) | $ / shares	1.24	1.34
Non-vested, end of period (in dollars per share) | $ / shares	$ 1.20	$ 0.44