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Note 13 - Capital Stock - Outstanding and Exercisable Options (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Range of Exercise Price, Lower Limit (in dollars per share)	$ 1.78
Range of Exercise Price, Upper Limit (in dollars per share)	$ 5.78
Options Outstanding, Shares Outstanding (in shares) | shares	2,266,122
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	5 years 346 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 3.93
Options Outstanding, Aggregate Intrinsic Value | $	$ 257
Options Exercisable, Shares Exercisable (in shares) | shares	1,649,299
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	4 years 255 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.28
Options Exercisable, Aggregate Intrinsic Value | $	$ 50
Exercise Price Range 1 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 1.78
Range of Exercise Price, Upper Limit (in dollars per share)	$ 2.59
Options Outstanding, Shares Outstanding (in shares) | shares	234,399
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	6 years 175 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 2.14
Options Outstanding, Aggregate Intrinsic Value | $	$ 213
Options Exercisable, Shares Exercisable (in shares) | shares	94,069
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	1 year 343 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 2.57
Options Exercisable, Aggregate Intrinsic Value | $	$ 45
Exercise Price Range 2 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 2.60
Range of Exercise Price, Upper Limit (in dollars per share)	$ 2.94
Options Outstanding, Shares Outstanding (in shares) | shares	208,414
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	9 years 189 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 2.84
Options Outstanding, Aggregate Intrinsic Value | $	$ 44
Options Exercisable, Shares Exercisable (in shares) | shares	10,000
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	7 years 91 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 2.60
Options Exercisable, Aggregate Intrinsic Value | $	$ 5
Exercise Price Range 3 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 2.95
Range of Exercise Price, Upper Limit (in dollars per share)	$ 3.49
Options Outstanding, Shares Outstanding (in shares) | shares	264,571
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	8 years
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 3.23
Options Outstanding, Aggregate Intrinsic Value | $
Options Exercisable, Shares Exercisable (in shares) | shares	148,400
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	7 years 164 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 3.27
Options Exercisable, Aggregate Intrinsic Value | $
Exercise Price Range 4 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 3.50
Range of Exercise Price, Upper Limit (in dollars per share)	$ 3.92
Options Outstanding, Shares Outstanding (in shares) | shares	305,839
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	7 years 116 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 3.74
Options Outstanding, Aggregate Intrinsic Value | $
Options Exercisable, Shares Exercisable (in shares) | shares	166,431
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	5 years 277 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 3.70
Options Exercisable, Aggregate Intrinsic Value | $
Exercise Price Range 5 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 3.93
Range of Exercise Price, Upper Limit (in dollars per share)	$ 4.08
Options Outstanding, Shares Outstanding (in shares) | shares	65,849
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	1 year 153 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.04
Options Outstanding, Aggregate Intrinsic Value | $
Options Exercisable, Shares Exercisable (in shares) | shares	65,849
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	1 year 153 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.04
Options Exercisable, Aggregate Intrinsic Value | $
Exercise Price Range 6 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 4.09
Range of Exercise Price, Upper Limit (in dollars per share)	$ 4.17
Options Outstanding, Shares Outstanding (in shares) | shares	355,625
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	4 years 149 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.12
Options Outstanding, Aggregate Intrinsic Value | $
Options Exercisable, Shares Exercisable (in shares) | shares	355,625
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	4 years 149 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.12
Options Exercisable, Aggregate Intrinsic Value | $
Exercise Price Range 7 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 4.18
Range of Exercise Price, Upper Limit (in dollars per share)	$ 4.38
Options Outstanding, Shares Outstanding (in shares) | shares	370,000
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	3 years 339 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.30
Options Outstanding, Aggregate Intrinsic Value | $
Options Exercisable, Shares Exercisable (in shares) | shares	370,000
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	3 years 339 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.30
Options Exercisable, Aggregate Intrinsic Value | $
Exercise Price Range 8 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 4.39
Range of Exercise Price, Upper Limit (in dollars per share)	$ 5.39
Options Outstanding, Shares Outstanding (in shares) | shares	141,550
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	5 years 204 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.99
Options Outstanding, Aggregate Intrinsic Value | $
Options Exercisable, Shares Exercisable (in shares) | shares	126,550
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	5 years 80 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.04
Options Exercisable, Aggregate Intrinsic Value | $
Exercise Price Range 9 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 5.40
Range of Exercise Price, Upper Limit (in dollars per share)	$ 5.54
Options Outstanding, Shares Outstanding (in shares) | shares	174,875
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	5 years 65 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.51
Options Outstanding, Aggregate Intrinsic Value | $
Options Exercisable, Shares Exercisable (in shares) | shares	174,875
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	5 years 65 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.51
Options Exercisable, Aggregate Intrinsic Value | $
Exercise Price Range 10 [Member]
Range of Exercise Price, Lower Limit (in dollars per share)	$ 5.55
Range of Exercise Price, Upper Limit (in dollars per share)	$ 5.75
Options Outstanding, Shares Outstanding (in shares) | shares	145,000
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	5 years 237 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.58
Options Outstanding, Aggregate Intrinsic Value | $
Options Exercisable, Shares Exercisable (in shares) | shares	137,500
Options Exercisable. Weighted Average Remaining Contractual Life (Year)	5 years 178 days
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.57
Options Exercisable, Aggregate Intrinsic Value | $

X

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- 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.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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