Note C - Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	Apr. 27, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Number of Operating Segments		2
Short-term Investments, Total		$ 13,100,000	$ 302,000
Cash, Uninsured Amount		700,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance		10,000	10,000
Proceeds from Notes Payable, Total		276,180
Unrecognized Tax Benefits, Ending Balance		0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total		$ 0	$ 0
Options and Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares		8,397,836	2,336,611
State and Local Jurisdiction [Member]
Open Tax Year		2017 2018 2019
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