Note 16 - Concentrations of Credit Risk (Details Textual)	3 Months Ended	12 Months Ended
Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Cash and Cash Equivalents, Including Long-term Cash Equivalents	$ 1,611,592	$ 1,226,045
Cash, Uninsured Amount	1,486,536	970,453
Accounts Receivable, after Allowance for Credit Loss, Total	$ 2,389,012	$ 3,933,540
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Number of Major Customers	2	2
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer One [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	$ 1,227,393	$ 1,618,244
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Customer Two [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	$ 432,546	$ 807,346

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes long-term cash equivalents. Excludes cash and cash equivalents within disposal group and discontinued operation.

No definition available.

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- Definition

Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.

+ References

No definition available.

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

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