Note 7 - Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Details
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 1,915	$ 2,512	$ 2,127
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	369	(124)	365
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	550	985	1,607
Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount	(7)	(9)	(146)
Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Transition Tax On Accumulated Foreign Earnings Amount	263	(266)	(3,230)	$ 6,288
Tax Cuts and Jobs Act of 2017 Global Intangible Low Taxed Income Income Tax Expense	(35)	59	179
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(13)	0	2
Provision for income taxes (note 7)	$ 3,042	$ 3,157	$ 904