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Note 8 - Stockholders' Equity (Deficiency) - Options Outstanding Separated Into Range of Exercise Price (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Outstanding (in shares)	2,388,348	2,782,560
Weighted average remaining contractual life, outstanding (Year)	5 years 314 days	6 years 89 days
Weighted average exercise price, outstanding (in dollars per share)	$ 15.243	$ 14.026
Exercisable (in shares)	1,752,416	1,794,249
Weighted average remaining contractual life, exercisable (Year)	5 years 43 days	5 years 12 days
Weighted average exercise price, exercisable (in dollars per share)	$ 12.583	$ 8.841
Range One [Member]
Lower range (in dollars per share)	0.901	0.907
Upper range (in dollars per share)	$ 1.576	$ 1.576
Outstanding (in shares)	710,562	978,178
Weighted average remaining contractual life, outstanding (Year)	2 years 175 days	2 years 336 days
Weighted average exercise price, outstanding (in dollars per share)	$ 1.317	$ 1.224
Exercisable (in shares)	710,562	978,178
Weighted average remaining contractual life, exercisable (Year)	2 years 175 days	2 years 336 days
Weighted average exercise price, exercisable (in dollars per share)	$ 1.317	$ 1.224
Range Two [Member]
Lower range (in dollars per share)	6.23	6.23
Upper range (in dollars per share)	$ 8.80	$ 8.80
Outstanding (in shares)	89,373	145,693
Weighted average remaining contractual life, outstanding (Year)	4 years 351 days	5 years 335 days
Weighted average exercise price, outstanding (in dollars per share)	$ 6.953	$ 6.786
Exercisable (in shares)	89,373	137,391
Weighted average remaining contractual life, exercisable (Year)	4 years 351 days	5 years 326 days
Weighted average exercise price, exercisable (in dollars per share)	$ 6.953	$ 6.785
Range Three [Member]
Lower range (in dollars per share)	12.47
Upper range (in dollars per share)	$ 16.87
Outstanding (in shares)	442,507	378,149
Weighted average remaining contractual life, outstanding (Year)	7 years 28 days	7 years 64 days
Weighted average exercise price, outstanding (in dollars per share)	$ 13.812	$ 12.47
Exercisable (in shares)	279,863	261,065
Weighted average remaining contractual life, exercisable (Year)	6 years 59 days	7 years 58 days
Weighted average exercise price, exercisable (in dollars per share)	$ 12.47	$ 12.47
Range Four [Member]
Lower range (in dollars per share)	19.51	19.51
Upper range (in dollars per share)	$ 21.66	$ 21.66
Outstanding (in shares)	546,959	640,743
Weighted average remaining contractual life, outstanding (Year)	7 years 227 days	8 years 222 days
Weighted average exercise price, outstanding (in dollars per share)	$ 21.205	$ 21.219
Exercisable (in shares)	307,302	211,571
Weighted average remaining contractual life, exercisable (Year)	7 years 203 days	8 years 174 days
Weighted average exercise price, exercisable (in dollars per share)	$ 21.20	$ 21.237
Range Five [Member]
Lower range (in dollars per share)	22.01	22.01
Upper range (in dollars per share)	$ 24.23	$ 24.23
Outstanding (in shares)	295,513	309,222
Weighted average remaining contractual life, outstanding (Year)	7 years 109 days	8 years 108 days
Weighted average exercise price, outstanding (in dollars per share)	$ 22.278	$ 22.293
Exercisable (in shares)	191,891	127,326
Weighted average remaining contractual life, exercisable (Year)	7 years 105 days	8 years 102 days
Weighted average exercise price, exercisable (in dollars per share)	$ 22.316	$ 22.365
Range Six [Member]
Outstanding (in shares)	154,200	154,200
Weighted average remaining contractual life, outstanding (Year)	8 years 52 days	9 years 54 days
Weighted average exercise price, outstanding (in dollars per share)	$ 29.88	$ 29.88
Exercisable (in shares)	70,684
Weighted average remaining contractual life, exercisable (Year)	8 years 52 days	0 years
Weighted average exercise price, exercisable (in dollars per share)	$ 29.88	$ 0
Range Seven [Member]
Outstanding (in shares)	149,234	176,375
Weighted average remaining contractual life, outstanding (Year)	7 years 82 days	8 years 82 days
Weighted average exercise price, outstanding (in dollars per share)	$ 39.86	$ 39.86
Exercisable (in shares)	102,741	78,718
Weighted average remaining contractual life, exercisable (Year)	7 years 82 days	8 years 82 days
Weighted average exercise price, exercisable (in dollars per share)	$ 39.86	$ 39.86

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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+ References

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- Definition

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+ References

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-Publisher FASB
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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.

+ References

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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-Publisher FASB
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