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Note 7 - Shareholders' Equity (Details) - Information About Stock Options Outstanding (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Options Outstanding, Number (in Shares)	2,131,622	2,211,488	2,356,228
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	4 years 116 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 6.99	$ 7.47	$ 8.34
Range of Exercise Prices, Options Exercisable, Number (in Shares)	1,107,116	1,013,098
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 6.32	$ 7.64
Price Range $3.22 To 3.79 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 3.22
Range of Exercise Prices, Upper Limit	$ 3.79
Range of Exercise Prices, Options Outstanding, Number (in Shares)	197,834
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	5 years 9 months
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 3.43
Range of Exercise Prices, Options Exercisable, Number (in Shares)	42,191
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 3.22
Price Range $3.80 To $3.91 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 3.80
Range of Exercise Prices, Upper Limit	$ 3.91
Range of Exercise Prices, Options Outstanding, Number (in Shares)	241,000
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	4 years 36 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 3.88
Range of Exercise Prices, Options Exercisable, Number (in Shares)	166,000
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 3.91
Price Range $3.92 To $4.41 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 3.92
Range of Exercise Prices, Upper Limit	$ 4.41
Range of Exercise Prices, Options Outstanding, Number (in Shares)	254,750
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	4 years 69 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 4.17
Range of Exercise Prices, Options Exercisable, Number (in Shares)	150,752
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 4.27
Price Range $4.42 To $4.69 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 4.42
Range of Exercise Prices, Upper Limit	$ 4.69
Range of Exercise Prices, Options Outstanding, Number (in Shares)	293,000
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	4 years 361 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 4.42
Range of Exercise Prices, Options Exercisable, Number (in Shares)	195,334
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 4.42
Price Range $4.70 To $5.46 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 4.70
Range of Exercise Prices, Upper Limit	$ 5.46
Range of Exercise Prices, Options Outstanding, Number (in Shares)	85,800
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	3 years 255 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 5.19
Range of Exercise Prices, Options Exercisable, Number (in Shares)	68,601
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 5.12
Price Range $5.47 To $6.42 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 5.47
Range of Exercise Prices, Upper Limit	$ 6.42
Range of Exercise Prices, Options Outstanding, Number (in Shares)	300,000
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	4 years 18 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 6.42
Range of Exercise Prices, Options Exercisable, Number (in Shares)	150,000
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 6.42
Price Range $6.43 To $10.55 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 6.43
Range of Exercise Prices, Upper Limit	$ 10.55
Range of Exercise Prices, Options Outstanding, Number (in Shares)	412,166
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	3 years 321 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 8.93
Range of Exercise Prices, Options Exercisable, Number (in Shares)	187,166
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 8.10
Price Range $10.56 To $12.74 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 10.56
Range of Exercise Prices, Upper Limit	$ 12.74
Range of Exercise Prices, Options Outstanding, Number (in Shares)	91,572
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	1 year 171 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 12.40
Range of Exercise Prices, Options Exercisable, Number (in Shares)	91,572
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 12.40
Price Range $12.75 To $13.22 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 12.75
Range of Exercise Prices, Upper Limit	$ 13.22
Range of Exercise Prices, Options Outstanding, Number (in Shares)	21,000
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	1 year 175 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 13.22
Range of Exercise Prices, Options Exercisable, Number (in Shares)	21,000
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 13.22
Price Range $13.23 To $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 13.23
Range of Exercise Prices, Upper Limit	$ 15.00
Range of Exercise Prices, Options Outstanding, Number (in Shares)	234,500
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	5 years 109 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 14.77
Range of Exercise Prices, Options Exercisable, Number (in Shares)	34,500
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 13.43
Price Range $3.22 To $15.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 3.22
Range of Exercise Prices, Upper Limit	$ 15.00
Range of Exercise Prices, Options Outstanding, Number (in Shares)	2,131,622
Range of Exercise Prices, Options Outstanding, Weighted- Average Remaining Contractual Life	4 years 116 days
Range of Exercise Prices, Options Outstanding, Weighted- Average Exercise Price	$ 7.18
Range of Exercise Prices, Options Exercisable, Number (in Shares)	1,107,116
Range of Exercise Prices, Options Exercisable, Weighted- Average Exercise Price	$ 6.32

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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 (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Balance Type:	na
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X

- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ 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 (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ 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 (c)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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

+ 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 (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The ceiling 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)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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