Note L - Segment Information (Details Textual) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Assets	$ 41,822,000	$ 39,785,000
Operating Segments [Member] | Merchant Investment [Member]
Assets	23,203,000
Operating Segments [Member] | Electronic Instruments [Member]
Assets	904,000
Corporate, Non-Segment [Member]
Assets	$ 17,715,000