Note 3 - Significant Accounting Policies - Basic and Diluted Earnings (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net loss attributable to common stockholders	$ (3,633)	$ (2,365)	$ (3,754)
Less: income attributable to participating securities	(269)	(229)	(120)
Subtotal	$ (3,902)	$ (2,594)	$ (3,874)
Weighted average common shares outstanding (in shares)	17,813	17,021	11,423
Basic and diluted net loss per share attributable to common stockholders (in dollars per share)	$ (0.22)	$ (0.15)	$ (0.34)

Net income after participating securities portion that available to common stockholders.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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-Publisher FASB
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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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