Note 9 - Income Taxes: Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Text Block [Abstract]
Property and equipment, principally due to differences in depreciation	$ 68	$ 71
Inventory reserves and other inventory-related temporary basis differences	437	361
Warranty, vacation, deferred rent and other liabilities	251	371
Retirement liabilities	543	645
Net operating loss carryforwards	35,532	38,536
Credit carryforwards	28	27
Other	181	143
Total deferred income tax assets	37,040	40,154
Less valuation allowance	(37,040)	(40,154)
Net deferred income tax assets	$ 0	$ 0