Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Abstract]
Insurance (primarily product liability)	$ 947	$ 900
Vacation	662	527
Inventory	642	339
Deferred compensation	162	303
Environmental	227	237
Doubtful accounts	97	158
Other	103	37
Total deferred tax assets	2,840	2,501
Goodwill and other intangibles	1,391	1,200
Depreciation	131	213
Deferred revenue	37
Total deferred tax liabilities	1,559	1,413
Net deferred tax assets	$ 1,281	$ 1,088