Note 3 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2022 shares	Dec. 31, 2022 USD ($)
Allowance for Sales Returns			$ 0		$ 179,000
Number of Operating Segments			2
Cash, Uninsured Amount	$ 1,700,000		$ 1,700,000
Marketable Securities, Current	2,450,470		2,450,470		0
Accounts Receivable, Allowance for Credit Loss	$ 26,000		$ 26,000		10,000
Weighted Average Number of Shares Outstanding, Basic (in shares) | shares	73,730,921	70,975,420	72,374,693	70,480,706
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares			3,930,654	8,135,704
US Treasury Securities [Member]
Marketable Securities, Current	$ 2,400,000		$ 2,400,000
Money Market Funds [Member]
Cash Equivalents, at Carrying Value	$ 2,200,000		$ 2,200,000		$ 8,700,000