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2004 Plan outstanding and exercisable options by price range (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Weighted average remaining life (in yrs.)	5 years 6 months	5 years 6 months 29 days
Price Range $0.95 - $1.25
Range of exercise	$ 0.95
Range of exercise	$ 1.25
Number outstanding options	352,081
Weighted average remaining life (in yrs.)	3 years 2 months 30 days
Weighted average exercise price (US$ per share)	$ 1.06
Number exercisable options	325,873
Weighted average exercise price	$ 1.06
Price Range $1.50 - $1.82
Range of exercise	1.50
Range of exercise	$ 1.82
Number outstanding options	99,540
Weighted average remaining life (in yrs.)	1 year
Weighted average exercise price (US$ per share)	$ 1.74
Number exercisable options	99,540
Weighted average exercise price	$ 1.74
Price Range $1.89 - $2.27
Range of exercise	1.89
Range of exercise	$ 2.27
Number outstanding options	456,891
Weighted average remaining life (in yrs.)	5 years 2 months 1 day
Weighted average exercise price (US$ per share)	$ 2.07
Number exercisable options	368,771
Weighted average exercise price	$ 2.11
Price Range $2.32 - $2.49
Range of exercise	2.32
Range of exercise	$ 2.49
Number outstanding options	407,826
Weighted average remaining life (in yrs.)	7 years 6 months 29 days
Weighted average exercise price (US$ per share)	$ 2.34
Number exercisable options	200,125
Weighted average exercise price	$ 2.35
Price Range $2.50 - $2.75
Range of exercise	2.50
Range of exercise	$ 2.75
Number outstanding options	241,188
Weighted average remaining life (in yrs.)	5 years 3 months 29 days
Weighted average exercise price (US$ per share)	$ 2.71
Number exercisable options	241,188
Weighted average exercise price	$ 2.71
Price Range $2.82 - $2.93
Range of exercise	2.82
Range of exercise	$ 2.93
Number outstanding options	195,355
Weighted average remaining life (in yrs.)	7 years 2 months 1 day
Weighted average exercise price (US$ per share)	$ 2.93
Number exercisable options	141,206
Weighted average exercise price	$ 2.93
Price Range $3.10 - $3.88
Range of exercise	3.10
Range of exercise	$ 3.88
Number outstanding options	73,400
Weighted average remaining life (in yrs.)	6 years
Weighted average exercise price (US$ per share)	$ 3.69
Number exercisable options	71,600
Weighted average exercise price	$ 3.70
Price Range $4.22 - $4.49
Range of exercise	4.22
Range of exercise	$ 4.49
Number outstanding options	168,525
Weighted average remaining life (in yrs.)	6 years 5 months 1 day
Weighted average exercise price (US$ per share)	$ 4.25
Number exercisable options	154,392
Weighted average exercise price	$ 4.24
Price Range $0.95 - $4.49
Range of exercise	0.95
Range of exercise	$ 4.49
Number outstanding options	1,994,806
Weighted average remaining life (in yrs.)	5 years 6 months
Weighted average exercise price (US$ per share)	$ 2.42
Number exercisable options	1,602,695
Weighted average exercise price	$ 2.34

X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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