Note E - Convertible Preferred Stock (Details Textual) $ / shares in Units, $ in Millions		3 Months Ended
	Jan. 30, 2018 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 shares
Preferred Stock, Shares Authorized (in shares) | shares		1,000,000	1,000,000
Temporary Equity, Liquidation Preference Per Share (in dollars per share) | $ / shares		$ 158.36
Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage		5.00%
Temporary Equity, Liquidation Preference		$ 1.6
Convertible Preferred Stock, Conversion Ratio		100.91
Series A Preferred Stock [Member] | Wipro [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	9,926
Shares Issued, Price Per Share (in dollars per share) | $ / shares	$ 1,000
Stock Issued During Period, Value, New Issues	$ 9.9
Payments of Stock Issuance Costs	0.2
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 9.9