Note 3 - Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Contract with Customer, Asset, after Allowance for Credit Loss, Total	$ 4,800,000		$ 4,800,000
Licensing Agreements [Member]
Finite-Lived Intangible Asset, Useful Life (Year)			6 years
Amortization of Intangible Assets, Total	$ 5,250	$ 5,250	$ 15,570	$ 15,750

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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