Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
FIFO Inventory Amount	$ 1,356,000	$ 1,287,000
Inventory Valuation Reserves, Ending Balance	$ 12,000	$ 9,000
Finite-Lived Intangible Asset, Useful Life	10 years 109 days
Impairment of Long-Lived Assets Held-for-use	$ 0
Share-based Payment Arrangement, Option [Member]
Number of Option Shares Excluded from Weighted Average Common Shares Outstanding \| shares	19,250	18,000
Weighted Average Exercise Price Options Excluded From Weighted Average Common Share Outstanding \| $ / shares	$ 11.32	$ 13.22
Export [Member] \| Minimum [Member]
Accounts Receivable Credit Term	30 days
Export [Member] \| Maximum [Member]
Accounts Receivable Credit Term	90 days
Revenue, Segment Benchmark [Member] \| Customer Concentration Risk [Member] \| Export [Member]
Concentration Risk, Percentage	29.40%	29.40%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member]
Number of Major Customers	0	0
Revenue Benchmark [Member] \| Geographic Concentration Risk [Member] \| Geographic Distribution, Foreign [Member]
Concentration Risk, Percentage	29.00%	29.00%

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The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of valuation reserve for inventory.

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