Note 10 - Stockholders' Equity (Details) - Summary of Outstanding Options by Exercise Price Ranges (USD $)	12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Option Shares (in Shares)	72,400
Options Outstanding, Weighted Average Exercise Price	$ 5.16
Options Outstanding, Weighted Average Maturity (Years)	6 years 62 days
Options Exercisable, Option Shares (in Shares)	72,400
Options Exercisable, Weighted Average Exercise Price	$ 5.16
Options Exercisable, Weighted Average Maturity (Years)	6 years 62 days
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, lower Limit	$ 4.27
Exercise Price Range, Upper Limit	$ 4.41
Options Outstanding, Option Shares (in Shares)	23,400
Options Outstanding, Weighted Average Exercise Price	$ 4.39
Options Outstanding, Weighted Average Maturity (Years)	5 years 277 days
Options Exercisable, Option Shares (in Shares)	23,400
Options Exercisable, Weighted Average Exercise Price	$ 4.39
Options Exercisable, Weighted Average Maturity (Years)	5 years 277 days
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, lower Limit	$ 4.80
Exercise Price Range, Upper Limit	$ 4.96
Options Outstanding, Option Shares (in Shares)	16,000
Options Outstanding, Weighted Average Exercise Price	$ 4.84
Options Outstanding, Weighted Average Maturity (Years)	4 years 313 days
Options Exercisable, Option Shares (in Shares)	16,000
Options Exercisable, Weighted Average Exercise Price	$ 4.84
Options Exercisable, Weighted Average Maturity (Years)	4 years 313 days
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, lower Limit	$ 5.30
Exercise Price Range, Upper Limit	$ 6.87
Options Outstanding, Option Shares (in Shares)	33,000
Options Outstanding, Weighted Average Exercise Price	$ 5.86
Options Outstanding, Weighted Average Maturity (Years)	7 years 36 days
Options Exercisable, Option Shares (in Shares)	33,000
Options Exercisable, Weighted Average Exercise Price	$ 5.86
Options Exercisable, Weighted Average Maturity (Years)	7 years 36 days

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

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

-Publisher FASB

-Name Accounting Standards Codification

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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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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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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.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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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.

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

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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.

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