Note 8 - Stockholders' Equity - Summary of Information Concerning Outstanding and Exercisable Stock Options (Details)	Mar. 31, 2019 $ / shares shares
Number of outstanding (in shares)	3,420,750
Number of exercisable (in shares)	3,226,050
Range 1 [Member]
Number of outstanding (in shares)	805,000
Range of exercise prices per share (in dollars per share) \| $ / shares	$ 0.42
Number of exercisable (in shares)	805,000
Range 2 [Member]
Number of outstanding (in shares)	567,750
Range of exercise prices per share (in dollars per share) \| $ / shares	$ 0.42
Number of exercisable (in shares)	427,050
Range 3 [Member]
Number of outstanding (in shares)	773,000
Range of exercise prices per share (in dollars per share) \| $ / shares	$ 0.42
Number of exercisable (in shares)	719,000
Range 4 [Member]
Number of outstanding (in shares)	1,275,000
Range of exercise prices per share (in dollars per share) \| $ / shares	$ 0.50
Number of exercisable (in shares)	1,275,000

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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