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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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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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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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

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Note 14 - Stock Option Plans - Stock Options Outstanding and Exercisable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number Outstanding (in shares)	243,500	304,500	274,500
Options Outstanding Exercise Price Range1 [Member]
Lower Range of Exercise Price (in dollars per share)	$ 0.69
Upper Range of Exercise Price (in dollars per share)	$ 1.72
Number Outstanding (in shares)	166,500
Wgt. Avg. Contractual Life Remaining (yrs) (Year)	3 years 328 days
Wgt. Avg. Exercise Price (in dollars per share)	$ 1.50
Aggregate Intrinsic Value	$ 508,730
Options Exercisable Exercise Price Range 1 [Member]
Lower Range of Exercise Price (in dollars per share)	$ 0.69
Upper Range of Exercise Price (in dollars per share)	$ 1.72
Aggregate Intrinsic Value	$ 508,730
Exercisable Options (in shares)	166,500
Weighted-Average Contractual Life Remaining - Exercisable (Year)	3 years 328 days
Weighted-Average Exercise Price - Exercisable (in dollars per share)	$ 1.50
Options Outstanding Exercise Price Range2 [Member]
Lower Range of Exercise Price (in dollars per share)	2.97
Upper Range of Exercise Price (in dollars per share)	$ 3.89
Number Outstanding (in shares)	77,000
Wgt. Avg. Contractual Life Remaining (yrs) (Year)	7 years 109 days
Wgt. Avg. Exercise Price (in dollars per share)	$ 3.60
Aggregate Intrinsic Value	$ 74,000
Options Exercisable Exercise Price Range 2 [Member]
Lower Range of Exercise Price (in dollars per share)	$ 2.97
Upper Range of Exercise Price (in dollars per share)	$ 3.89
Aggregate Intrinsic Value	$ 47,260
Exercisable Options (in shares)	40,000
Weighted-Average Contractual Life Remaining - Exercisable (Year)	5 years 292 days
Weighted-Average Exercise Price - Exercisable (in dollars per share)	$ 3.38
Options Outstanding Exercise Price Range 3 [Member]
Lower Range of Exercise Price (in dollars per share)	0.69
Upper Range of Exercise Price (in dollars per share)	$ 3.89
Number Outstanding (in shares)	243,500
Wgt. Avg. Contractual Life Remaining (yrs) (Year)	5 years
Wgt. Avg. Exercise Price (in dollars per share)	$ 2.17
Aggregate Intrinsic Value	$ 582,730
Options Exercisable Exercise Price Range3 [Member]
Lower Range of Exercise Price (in dollars per share)	$ 0.69
Upper Range of Exercise Price (in dollars per share)	$ 3.89
Aggregate Intrinsic Value	$ 555,990
Exercisable Options (in shares)	206,500
Weighted-Average Contractual Life Remaining - Exercisable (Year)	4 years 109 days
Weighted-Average Exercise Price - Exercisable (in dollars per share)	$ 1.87