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Note 3 - Concentration of Credit Risk (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021	Jun. 30, 2022 USD ($)	Jun. 30, 2021	Dec. 31, 2021 USD ($)
Cash and Cash Equivalents, at Carrying Value, Total	$ 12,159,052		$ 12,159,052		$ 16,651,371
Cash Equivalents, at Carrying Value, Total	7,000,000.0		7,000,000.0		7,000,000.0
Cash, Uninsured Amount	$ 4,100,000		$ 4,100,000		$ 8,600,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number Of Major Customers	2		2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer A [Member]
Concentration Risk, Percentage	24.30%	17.30%	16.20%	18.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer B [Member]
Concentration Risk, Percentage	14.80%	12.90%	12.20%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer C [Member]
Concentration Risk, Percentage		11.20%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Number Of Major Customers			3	1	2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Customer A [Member]
Concentration Risk, Percentage			54.10%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]
Concentration Risk, Percentage					50.00%

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Number of major customers.

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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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