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INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2018
INCOME TAXES  
Schedule of components of the provision for income taxes
Years ended December 31,   2018     2017     2016  
(in thousands)                        
Current provision:                        
Federal   $ 6,173     $ 8,623     $ 7,263  
State     616       546       261  
Deferred (benefit) provision:                        
Federal     384       1,511       (507 )
State     (6 )     8       (355 )
Total income tax provision   $ 7,167     $ 10,688     $ 6,662  
Schedule of reconciliation between the federal statutory rate and Marine Products' effective tax rate
Years ended December 31,   2018     2017     2016  
Federal statutory rate     21.0 %     35.0 %     35.0 %
State income taxes, net of federal benefit     1.5       1.1       0.7  
Research and experimentation credit     (0.8 )     (0.8 )     (1.0 )
Tax-exempt interest     (0.1 )     (0.2 )     (0.4 )
Tax-exempt loss (gain) on SERP assets     0.3       (0.6 )     (1.3 )
Manufacturing deduction           (3.0 )     (3.0 )
FDII deduction     (0.4 )            
Change in valuation allowance     (0.1 )     (0.1 )     (1.4 )
Adjustments related to the Act     (0.3 )     5.6        
Adjustments related to vesting of restricted stock     (1.8 )     (2.4 )      
Other     0.8       1.0       (0.1 )
Effective tax rate     20.1 %     35.6 %     28.5 %
Schedule of components of deferred tax assets and liabilities
December 31,   2018     2017  
(in thousands)                
Deferred tax assets:                
Warranty costs   $ 1,233     $ 1,182  
Sales incentives and discounts     317       348  
Stock-based compensation     667       611  
Pension     1,337       1,406  
Uniform capitalization     44       47  
All others     515       479  
State credits and NOL’s     3,382       6,124  
Valuation allowance     (2,794 )     (5,447 )
Total deferred tax assets     4,701       4,750  
Deferred tax liabilities:                
Depreciation and amortization expense     (1,009 )     (781 )
 Basis differences in joint venture     (367 )     (320 )
Net deferred tax assets   $ 3,325     $ 3,649  
Schedule of unrecognized tax benefits
    2018     2017  
Balance at January 1   $ 243,000     $ 15,000  
 Additions based on tax positions related to the current year     81,000       12,000  
 Additions for tax positions of prior years     69,000       216,000  
Balance at December 31   $ 393,000     $ 243,000