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Note 9 - Stock-based Compensation (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 12, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance		549,011	624,256
The 2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance	549,011
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares, Authorized and Unissued	946,083
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	$ 90,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	219 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 0

X

- Definition

Represents the number of shares authorized but not issued.

+ References

No definition available.

+ Details

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X

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

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X

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

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

+ References

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- Definition

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

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