Note 9 - Income Taxes: Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Details
Deferred Tax Assets, Inventory	$ 60	$ 56	$ 98
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	18	16	25
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	62	89	147
Deferred Tax Assets, Other	0	4	(23)
Deferred Tax Liabilities Depreciation and Amortization	(3,216)	(3,789)	(4,277)
Unrealized investment loss	0	66	105
Deferred Tax Liabilities, Net	$ (3,076)	$ (3,558)	$ (3,925)