Note 7 - Income Taxes: Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Details
Deferred Tax Assets, Inventory	$ 84	$ 60	$ 56
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	33	18	16
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	55	62	89
Deferred Tax Assets, Other	0	0	4
Deferred Tax Liabilities Depreciation and Amortization	(2,933)	(3,216)	(3,789)
Unrealized investment loss	0	0	66
Deferred Tax Liabilities, Net	$ (2,761)	$ (3,076)	$ (3,558)