Note A - The Company and Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Balance at beginning of year	$ 1,733,785	$ 1,013,785
Charges to costs and expenses		720,000
Deductions from reserves
Balance at end of year	$ 1,733,785	$ 1,733,785