Note 7 - Income Taxes: Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Details
Deferred Tax Assets, Inventory	$ 86	$ 84	$ 60
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	32	33	18
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	68	55	62
Deferred Tax Liabilities Depreciation and Amortization	(3,034)	(2,933)	(3,216)
Deferred Tax Liabilities, Net	$ (2,848)	$ (2,761)	$ (3,076)