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Note 8 - Earnings Per Share (EPS) - Reconciliation of Numerator of Basic and Diluted EPS Calculations (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic Numerator:
Net loss	$ (2,538,703)	$ (1,789,329)	$ (1,375,489)	$ (3,145,516)	$ (2,538,703)
Convertible preferred stock dividends	(401,250)	(200,625)	(200,625)	(401,250)	(401,250)
Net loss available to common stockholders	$ (2,939,953)	$ (1,989,954)	$ (1,576,114)	$ (3,546,766)	$ (2,939,953)
Basic Denominator (in shares)	5,516,726	6,359,974	5,523,072	6,228,197	5,516,726
Per Share Amount (in dollars per share)	$ (0.53)	$ (0.32)	$ (0.29)	$ (0.57)	$ (0.53)

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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.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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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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The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders.

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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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