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Note 9 - Geographic Information: Schedule Of Geographic Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Details |  |  |
Company Sales in the United States | $ 25,866 | $ 27,493 | $ 21,192
Company Sales in Europe | 6,399 | 8,906 | 9,160
Company Sales Other | $ 9,913 | $ 10,505 | $ 11,646

X
- Definition Represents the monetary amount of Company Sales in Europe, during the indicated time period. + References No definition available. + Details
Name: | fil_CompanySalesInEurope
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the monetary amount of Company Sales in the United States, during the indicated time period. + References No definition available. + Details
Name: | fil_CompanySalesInTheUnitedStates
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the monetary amount of Company Sales Other, during the indicated time period. + References No definition available. + Details
Name: | fil_CompanySalesOther
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TextBlockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration