Note G - 401(k) Plan (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employer Contribution Common Stock [Member]
Defined Contribution Plan, Percentage of Specified Salary Amount Matched by Employer	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Cost	$ 1,417,000	$ 1,292,000	$ 1,238,000
Employer Contribution Cash [Member]
Defined Contribution Plan, Percentage of Specified Salary Amount Matched by Employer	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%
Defined Contribution Plan, Cost	$ 978,000	936,000	884,000
Certain Employees [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%
The 401 (k) for Employees at Amron Division of the AMTEC Subsidiary [Member]
Defined Contribution Plan, Cost	$ 392,000	$ 417,000	$ 427,000