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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The highest quantity of shares an employee can purchase under the plan per period.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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

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

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Note 9 - Summary of Stock Options (Details Textual) - USD ($)			1 Months Ended								3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 23, 2016	Aug. 22, 2016	Sep. 30, 2017	Aug. 30, 2017	May 31, 2017	Jan. 31, 2017	Nov. 30, 2016	Sep. 30, 2016	Aug. 31, 2016	Jan. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Aug. 15, 2017	Aug. 14, 2017	Dec. 22, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			2,489,979								2,489,979		2,489,979		1,909,764
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price			$ 5.88								$ 5.88		$ 5.88		$ 6.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term													8 years 255 days		9 years 43 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross													739,985
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period													7,730
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value													$ 31,000	$ 5,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate											0.00%	0.00%	0.00%	0.00%
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options			$ 4,400,000								$ 4,400,000		$ 4,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition													2 years 313 days
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate													0.00%
Two Thousand Five Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			0								0		0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			0								0		0
The 2006 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			38,378								38,378		38,378
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price			$ 10.49								$ 10.49		$ 10.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term													5 years 47 days
The 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number			2,451,601								2,451,601		2,451,601
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price			$ 5.80								$ 5.80		$ 5.80
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term													8 years 277 days
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period													10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period													4 years
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum													10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent													110.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Percentage Increase of Outstanding Common Stock		4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	523,209
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	2,523,209															4,000,000	2,523,209	2,000,000
Common Stock, Capital Shares Reserved for Future Issuance			1,408,655								1,408,655		1,408,655
The 2013 Plan [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross											305,000	220,915	720,110	378,932
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value											$ 3.19	$ 3.58	$ 2.83	$ 3.54
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period													7,730	3,020
The 2013 Plan [Member] \| Nonemployees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross											14,000	50,000	19,875	50,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value											$ 3.66	$ 4.81	$ 4.09	$ 4.81
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period													0	0
The 2013 Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number			0								0		0
The 2013 Plan [Member] \| Restricted Stock [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period										39,494
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value										$ 6.24
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period								89
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period						39,405
The 2013 Plan [Member] \| Restricted Stock [Member] \| Board Members [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			6,947		4,797		6,544		5,998
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 5.58		$ 7.07		$ 5.91		$ 7.89
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			6,947		4,797		6,544		5,998
The 2013 Plan [Member] \| Restricted Stock [Member] \| Consultant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								25,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value								$ 7.58
The 2013 Plan [Member] \| Holdings Greater Than 10 Percent of Shares Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period													5 years
The 2013 Plan [Member] \| Quarterly [Member] \| Restricted Stock [Member] \| Consultant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period													25,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage								25.00%
2017 Employee Stock Purchase Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance				400,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee				2,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date				85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period				90 days