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Note 3 - Summary of Significant Accounting Policies (Details Textual)		3 Months Ended
	Apr. 27, 2020 USD ($)	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 shares	Dec. 31, 2020 USD ($)
Number of Operating Segments		2
Short-term Investments, Total		$ 15,000,000		$ 13,100,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance		10,000		10,000
Inventory Valuation Reserves, Ending Balance		450,000		453,000
Unrecognized Tax Benefits, Ending Balance		0		$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total		$ 0
Options and Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) \| shares		6,092,193	1,875,886
Paycheck Protection Program CARES Act [Member]
Proceeds from Notes Payable, Total	$ 276,000
Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)		2 years
Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)		7 years