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Note 1 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Number of Operating Segments 1  
Fair Value, Assets (Liabilities), Transfers Between Level 1, Level 2, and Level 3, Amount $ 0 $ 0
Accounts Receivable, Noncurrent, Threshold Period Past Due (Day) 30 days  
Accounts Receivable, Allowance for Credit Loss, Current $ 69 210
Depreciation, Total 3,167 3,017
Goodwill, Impairment Loss 0 0
Impairment of Intangible Assets, Finite-lived 0 0
Impairment, Long-Lived Asset, Held-for-Use, Total 0 0
Income Tax Examination, Interest Accrued 0 0
Income Tax Examination, Penalties and Interest Accrued, Total $ 0 0
Open Tax Year 2003 2004 2005 2009 2008 2010 2011 2012 2013 2015 2016 2017 2018  
Advertising Expense $ 291 644
Research and Development Expense, Total 5,315 5,248
Cost of Sales [Member]    
Customer Funded Tooling Income (Expense), Net of Reimbursements $ (552) (387)
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years  
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Tranche One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 1 year  
Maximum [Member]    
Property, Plant and Equipment, Useful Life (Year) 12 years  
Maximum [Member] | Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years  
Minimum [Member]    
Property, Plant and Equipment, Useful Life (Year) 3 years  
Held-to-maturity Securities [Member]    
Investment Income, Net, Total $ 72 $ 423
Held-to-maturity Securities [Member] | Maximum [Member]    
Debt Securities, Available-for-sale, Term (Year) 2 years  
Emerald Extrusion Services LLC [Member]    
Noncontrolling Interest, Ownership Percentage by Parent 54.00%