Note 1 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
FIFO Inventory Amount	$ 1,287,000	$ 1,183,000
Inventory Valuation Reserves, Ending Balance	9,000	7,000
Impairment of Intangible Assets, Finite-lived	0	0
Effective Income Tax Rate Reconciliation Tax Cuts and Jobs Act of 2017, Total Impact		$ (115,000)
Employee Stock Option [Member]
Number of Option Shares Excluded from Weighted Average Common Shares Outstanding \| shares	18,000	2,250
Weighted Average Exercise Price Options Excluded From Weighted Average Common Share Outstanding \| $ / shares	$ 13.22
Weighted Average Exercise Price, Options Excluded from Weighted Average, Common Shares Outstanding \| $ / shares		$ 8.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Number With Antidilutive Effect \| shares		15,918
Share Based Compensation Arrangement by Share Based Payment Award Options Outstanding with Antidilutive Effect Weighted Average Exercise Price \| $ / shares		$ 14.51
Patents [Member]
Finite-Lived Intangible Asset, Useful Life	10 years 36 days
Minimum [Member] \| Certificates of Deposit [Member]
Certificate of Deposit Maturity Period	30 days	30 days
Maximum [Member] \| Certificates of Deposit [Member]
Certificate of Deposit Maturity Period	1 year	1 year
Export [Member] \| Minimum [Member]
Accounts Receivable Credit Term	30 days
Export [Member] \| Maximum [Member]
Accounts Receivable Credit Term	90 days
Sales Revenue, Segment [Member] \| Customer Concentration Risk [Member] \| Export [Member]
Concentration Risk, Percentage	29.40%	30.50%
Trade Accounts Receivable [Member] \| Credit Concentration Risk [Member]
Concentration Risk, Percentage	27.60%	25.50%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Number of Major Customers	0	0
Sales Revenue, Net [Member] \| Geographic Concentration Risk [Member] \| Geographic Distribution, Foreign [Member]
Concentration Risk, Percentage	29.00%	31.00%

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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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