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Note S - Subsequent Events (Details Textual) - USD ($)								1 Months Ended	12 Months Ended
	Mar. 28, 2018	Mar. 23, 2018	Nov. 13, 2017	Sep. 22, 2017	Aug. 09, 2017	May 11, 2017	Mar. 15, 2017	May 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Conversion of Dividends Payable, Shares Issued				150,000
Conversion of Dividends Payable, Amount Converted									$ 540,000
Stock Issued During Period, Shares, Issued for Services								61,667
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price									$ 2.69	$ 2.74
Stock Issued During Period As a Commitment Fee, Shares								55,000
Director [Member]
Stock Issued During Period, Shares, Issued for Services			2,276		5,148	1,925	1,895
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		212,918
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 1.96
Stock Issued During Period As a Commitment Fee, Shares	762
Subsequent Event [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		7 years
Subsequent Event [Member] | Director [Member]
Stock Issued During Period, Shares, Issued for Services		7,659
Subsequent Event [Member] | Six Non-Employee Members of the Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		9,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 1.96
Subsequent Event [Member] | Six Non-Employee Members of the Board of Directors [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		7 years
Subsequent Event [Member] | Series B-1 Convertible Preferred Stock [Member]
Preferred Stock Conversion Limitation, Percent		19.99%
Subsequent Event [Member] | Conversion of Series B-1 Shares into Common Stock [Member]
Conversion of Stock, Shares Converted		60,240
Conversion of Stock, Shares Issued		1,678,334
Subsequent Event [Member] | Conversion of Dividends Payable on Series B-1 Preferred Stock to Common Stock [Member]
Conversion of Dividends Payable, Shares Issued		115,857
Conversion of Dividends Payable, Amount Converted		$ 417,084
Shares Issued, Price Per Share		$ 3.60

X

- Definition

The value of the dividends payable that are converted in a noncash (or part noncash) transaction.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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