Note E - Convertible Preferred Stock and Share Repurchase Program (Details Textual) - USD ($)		1 Months Ended	3 Months Ended
	Jan. 30, 2018	Dec. 31, 2022	Jun. 30, 2023	May 02, 2023	Jun. 30, 2022
Preferred Stock, Shares Authorized (in shares)		1,000,000.0
Stock Repurchase Program, Authorized Amount				$ 6,500,000
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 1	$ 1
Treasury Stock, Shares, Acquired (in shares)			300,000
Treasury Stock, Value, Acquired, Cost Method			$ 1,879,000
Preferred Stock [Member]
Treasury Stock, Value, Acquired, Cost Method			(0)
Common Stock [Member]
Treasury Stock, Value, Acquired, Cost Method			$ (0)
Wipro [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 1.00
Wipro [Member] | Common Stock [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)					100,000
Series A Preferred Stock [Member]
Treasury Stock, Shares, Acquired (in shares)		9,926
Series A Preferred Stock [Member] | Wipro [Member]
Stock Issued During Period, Shares, New Issues (in shares)	9,926
Shares Issued, Price Per Share (in dollars per share)	$ 1,000
Stock Issued During Period, Value, New Issues	$ 9,900,000
Payments of Stock Issuance Costs	200,000
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 9,900,000
Series A Preferred Stock [Member] | Wipro [Member] | Preferred Stock [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)					9,926
Stock Repurchase Program, Authorized Amount					$ 9,926,000