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Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Current:      
Federal $ 7,790 $ 6,516 $ 7,797
State 843 973 1,084
Foreign 88 210 213
Total current 8,721 7,699 9,094
Deferred:      
Federal 446 220 69
State 100 48 24
Total deferred 546 268 93
Provision for income taxes 9,267 7,967 9,187
Reconciliation of income taxes      
Federal tax at statutory rate 9,774 8,133 8,777
State taxes, net of federal benefit 613 664 721
Non-deductible expenses 269 192 195
Manufacturing benefit (847) (613) (586)
Credit for increasing research activities (439) (103) (30)
Change in valuation allowance 0 (334) 163
Other (103) 28 (53)
Provision for income taxes 9,267 7,967 $ 9,187
Current Deferred Income Tax Assets and Liabilities      
Accounts receivable reserves 409 370  
Inventory valuation adjustments 874 816  
Accrued liabilities (40) (19)  
Current Deferred Income Tax Assets and Liabilities 1,243 1,167  
Non-Current Deferred Income Tax Assets      
Goodwill and other intangible assets 2,264 3,376  
Property, plant and equipment 1,725 1,372  
Foreign net operating loss carryforwards 2,103 1,881  
Foreign tax credit carryforwards 321 184  
Non-Current Deferred Income Tax Assets 6,413 6,813  
Less valuation allowance (2,103) (1,881)  
Deferred tax assets, net $ 4,310 $ 4,932