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Note 10 - Stockholders’ Equity (Details) - Share-based Compensation, Stock Options, Activity - USD ($)		3 Months Ended	12 Months Ended
		Mar. 31, 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 259 days	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 219 days	3 years 9 months
Number of Shares, Forfeited		0
Average Exercise Price per Share, Forfeited		$ 0
Number of Shares, Outstanding		1,367,500
Average Exercise Price per Share, Outstanding		$ 1.34
Aggregate Intrinsic Value, Outstanding	[1]	$ 0
Number of Shares, Exercisable		1,217,500
Average Exercise Price per Share, Exercisable		$ 1.36
Aggregate Intrinsic Value, Exercisable	[1]	$ 0
[1] The intrinsic value of the stock options at March 29, 2019 is the amount by which the market value of the Company's common stock of $0.88 as of March 29, 2019 exceeds the exercise price of the option.

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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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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 price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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

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