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Note 17 - Stock Option and Purchase Plans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,153,271 1,444,771
Share-based Payment Arrangement, Expense $ 469,000 $ 637,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.46 $ 0.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 478,000  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 318,000 $ 184,000
The 2010 Sypris Omnibus Plan [Member]    
Share Based Compensation Arrangement By Share Based Payment Award Award Lapsing Restrictions Period 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
The 2015 Omnibus Plan [Member]    
Share Based Compensation Arrangement By Share Based Payment Award Award Lapsing Restrictions Period 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 5 years  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Share-based Payment Arrangement, Option [Member] | The 2010 Sypris Omnibus Plan [Member]    
Common Stock, Capital Shares Reserved for Future Issuance 3,655,088  
Share-based Payment Arrangement, Option [Member] | The 2015 Omnibus Plan [Member]    
Common Stock, Capital Shares Reserved for Future Issuance 3,476,021  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 533,000 $ 381,000