Note 3 - Summary of Significant Accounting Policies (Details Textual)	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) shares	Mar. 31, 2023 shares	Dec. 31, 2022 USD ($)
Payments for Repurchase of Redeemable Noncontrolling Interest	$ 214,000
Allowance for Sales Returns		$ 0		$ 179,000
Number of Operating Segments		2
Cash, Uninsured Amount		$ 3,400,000
Marketable Securities, Current	2,976,573	1,000,000
Accounts Receivable, Allowance for Credit Loss	10,000	$ 10,000
Weighted Average Number of Shares Outstanding, Basic (in shares) | shares		79,738,551	72,104,234
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares		3,296,480	7,670,661
Marketable Securities	2,976,573	$ 1,000,000
US Treasury Securities [Member]
Marketable Securities, Current		1,000,000
Money Market Funds [Member]
Cash Equivalents, at Carrying Value	$ 3,000,000	$ 4,000,000