Note H - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Research and development expenses	$ 3,215,000	$ 1,284,000
State NOL and tax credit carryforwards	1,534,000	2,336,000
Insurance (primarily product liability)	1,128,000	1,142,000
Other	1,654,000	1,457,000
Inventory	969,000	1,095,000
Vacation	904,000	908,000
Doubtful accounts	140,000	1,933,000
Subtotal	9,544,000	10,155,000
Deferred Tax Assets, Valuation Allowance	954,000	1,960,000
Total deferred tax assets	8,590,000	8,195,000
Goodwill and other intangibles	1,921,000	2,157,000
Depreciation	860,000	532,000
Deferred revenue	6,000	0
Total deferred tax liabilities	2,787,000	2,689,000
Net deferred tax assets	$ 5,803,000	$ 5,506,000