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Note 3 - Concentration of Credit Risk (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020	Sep. 30, 2021 USD ($)	Sep. 30, 2020	Dec. 31, 2020 USD ($)
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 17,446,404		$ 17,446,404		$ 7,699,335
Cash Equivalents, at Carrying Value, Total	7,000,000.0		7,000,000.0		7,000,000.0
Cash, Uninsured Amount	$ 9,294,000		$ 9,294,000		$ 5,822,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number Of Major Customers	2	2	2	3
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer A [Member]
Concentration Risk, Percentage	15.60%	13.50%	12.00%	21.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer B [Member]
Concentration Risk, Percentage	11.80%	12.50%	11.70%	12.80%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number Of Major Customers			1		2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer C [Member]
Concentration Risk, Percentage				12.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]
Concentration Risk, Percentage			28.70%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage					35.00%

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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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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