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Note 10 - Stockholders’ Equity (Details) - Share-based Compensation, Stock Options, Activity - USD ($)		9 Months Ended	12 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Share-based Compensation, Stock Options, Activity [Abstract]
Number of Shares, Outstanding		1,067,500	1,072,500
Average Exercise Price per Share, Outstanding		$ 1.39	$ 1.37
Aggregate Intrinsic Value, Outstanding	[1]	$ 374,750	$ 1,309,425
Weighted Average Remaining Contractual Term in Years, Outstanding		3 years 350 days	4 years 244 days
Number of Shares, Exercisable		1,050,000	532,500
Average Exercise Price per Share, Exercisable		$ 1.38	$ 1.37
Aggregate Intrinsic Value, Exercisable	[1]	$ 376,675	$ 649,725
Weighted Average Remaining Contractual Term in Years, Exercisable		3 years 343 days	4 years 244 days
Number of Shares, Granted		35,000
Average Exercise Price per Share, Granted		$ 1.85
Weighted Average Remaining Contractual Term in Years, Granted		5 years
Number of Shares, Exercised		(40,000)
Average Exercise Price per Share, Exercised		$ 1.26
Number of Shares, Forfeited		0
Average Exercise Price per Share, Forfeited		$ 0
[1] The intrinsic value of the stock options at September 28, 2018 is the amount by which the market value of the Company's common stock of $1.74 as of September 28, 2018 exceeds the exercise price of the option.

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Weighted average remaining contractual term for vested portions of options 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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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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