Note A - Organization and Operations (Details Textual) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 15, 2022
Yuhan Optoelectronic Technology (Shanghai) Co., Ltd [Member] | Forecast [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	10.00%
Manufacturing Facilities in the PRC and Certain Assets [Member]
Disposal Group, Including Discontinued Operation, Consideration		$ 150
Manufacturing Facilities in the PRC and Certain Assets [Member] | Minimum [Member]
Disposal Group, Percentage of Transaction Price to Invest		4.00%
Manufacturing Facilities in the PRC and Certain Assets [Member] | Maximum [Member]
Disposal Group, Percentage of Transaction Price to Invest		10.00%