Note 3 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($) shares	Mar. 31, 2022 shares	Dec. 31, 2022 USD ($)	Mar. 01, 2023 USD ($)
Allowance for Sales Returns	$ 0		$ 179,000
Number of Operating Segments	2
Cash, Uninsured Amount			8,300,000	$ 6,500,000
Marketable Securities, Current	$ 4,430,384		0
Accounts Receivable, Allowance for Credit Loss			10,000
Weighted Average Number of Shares Outstanding, Basic (in shares) | shares	72,104,234	69,013,001
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	7,670,661	7,543,252
US Treasury Securities [Member]
Marketable Securities, Current	$ 4,400,000
Money Market Funds [Member]
Cash Equivalents, at Carrying Value, Total	$ 2,300,000		$ 8,700,000