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Note 10 - Stockholders’ Equity (Details) - Share-based Compensation, Stock Options, Activity - USD ($)		9 Months Ended	12 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
Share-based Compensation, Stock Options, Activity [Abstract]
Number of Shares, Outstanding			1,367,500
Average Exercise Price per Share, Outstanding			$ 1.34
Weighted Average Remaining Contractual Term in Years, Outstanding		3 years 3 months	3 years 350 days
Number of Shares, Exercisable			1,125,000
Average Exercise Price per Share, Exercisable			$ 1.37
Weighted Average Remaining Contractual Term in Years, Exercisable		3 years 83 days	3 years 9 months
Number of Shares, Granted		35,000
Average Exercise Price per Share, Granted		$ 0.77
Weighted Average Remaining Contractual Term in Years, Granted		4 years 321 days
Number of Shares, Forfeited		0
Average Exercise Price per Share, Forfeited		$ 0
Number of Shares, Outstanding		1,402,500
Average Exercise Price per Share, Outstanding		$ 1.33
Aggregate Intrinsic Value, Outstanding	[1]	$ 0
Number of Shares, Exercisable		1,385,000
Average Exercise Price per Share, Exercisable		$ 1.34
Aggregate Intrinsic Value, Exercisable	[1]	$ 0
[1] The intrinsic value of the stock options at September 30, 2019 is the amount by which the market value of the Company's common stock of $0.64 as of September 30, 2019 exceeds the exercise price of the option.

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

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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

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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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

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