Note H - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
State NOL and tax credit carryforwards	$ 2,336,000	$ 2,153,000
Doubtful accounts	1,933,000	1,928,000
Research and development expenses	1,284,000	0
Insurance (primarily product liability)	1,142,000	1,073,000
Inventory	1,095,000	803,000
Vacation	908,000	855,000
Other	1,457,000	1,502,000
Subtotal	10,155,000	8,314,000
Deferred Tax Assets, Valuation Allowance	1,960,000	1,695,000
Total deferred tax assets	8,195,000	6,619,000
Goodwill and other intangibles	2,157,000	1,974,000
Depreciation	532,000	0
Deferred revenue	0	3,000
Total deferred tax liabilities	2,689,000	1,977,000
Net deferred tax assets	$ 5,506,000	$ 4,642,000