Note 3 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2022 shares	Dec. 31, 2022 USD ($)
Allowance for Sales Returns			$ 0		$ 179,000
Number of Operating Segments			2
Cash, Uninsured Amount	$ 3,400,000		$ 3,400,000		8,300,000
Marketable Securities, Current	1,981,180		1,981,180		0
Accounts Receivable, Allowance for Credit Loss	$ 27,000		$ 27,000		10,000
Weighted Average Number of Shares Outstanding, Basic (in shares) | shares	72,333,656	70,356,796	72,048,223	70,585,590
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares			4,142,155	8,166,380
US Treasury Securities [Member]
Marketable Securities, Current	$ 2,000,000.0		$ 2,000,000.0
Money Market Funds [Member]
Cash Equivalents, at Carrying Value	$ 3,700,000		$ 3,700,000		$ 8,700,000