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Note 18 - Stock Option and Purchase Plans (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,712,021 3,476,021
Treasury Stock, Shares 1,192 49,692
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.38 $ 0.82
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 1,163,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 73 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 0 $ 0
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  
Employee Stock Option [Member] | The 2010 Sypris Omnibus Plan [Member]    
Common Stock, Capital Shares Reserved for Future Issuance   3,655,088
Employee Stock 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 $ 536,000 $ 230,000
Treasury Stock, Shares 194,354 28,999
Treasury Stock Acquired, Average Cost Per Share $ 0.98 $ 2.65