Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2021	40,851,945
Balance at Dec. 31, 2021	$ 4,000	$ 91,025,000	$ (49,759,000)	$ (6,000)	$ 41,264,000
Common shares issued upon exercise of stock options (in shares)	50,000
Common shares issued upon exercise of stock options	$ 0	75,000	0	0	75,000
Share-based compensation expense	$ 0	1,029,000	0	0	1,029,000
Common shares issued upon vesting of restricted stock units (in shares)	49,252
Net loss	$ 0	0	(5,432,000)	0	(5,432,000)
Net unrealized gain (loss) on short-term investments	0	0	0	(23,000)	(23,000)
Net loss for the period	$ 0	0	(5,432,000)	0	(5,432,000)
Balance (in shares) at Mar. 31, 2022	40,951,197
Balance at Mar. 31, 2022	$ 4,000	92,129,000	(55,191,000)	(29,000)	36,913,000
Balance (in shares) at Dec. 31, 2022	41,175,993
Balance at Dec. 31, 2022	$ 4,000	94,333,000	(67,376,000)	94,000	$ 27,055,000
Common shares issued upon exercise of stock options (in shares)	250				250
Common shares issued upon exercise of stock options	$ 0	0	0	0	$ 0
Share-based compensation expense	$ 0	628,000	0	0	628,000
Common shares issued upon vesting of restricted stock units (in shares)	94,057
Common shares issued upon vesting of restricted stock units	$ 0	0	0	0	0
Settlement – US Treasury bills	0	0	0	(94,000)	(94,000)
Net loss	0	0	(4,028,000)	0	(4,028,000)
Net unrealized gain (loss) on short-term investments					0
Net loss for the period	$ 0	0	(4,028,000)	0	(4,028,000)
Balance (in shares) at Mar. 31, 2023	41,270,300
Balance at Mar. 31, 2023	$ 4,000	$ 94,961,000	$ (71,404,000)	$ 0	$ 23,561,000