The Company provides the following distinctive services: (a) direct hire placement services, (b) temporary professional services staffing in the fields of information technology, engineering, medical, and accounting, and (c) temporary light industrial staffing. These distinct services can be divided into two reportable segments, Industrial Staffing Services and Professional Staffing Services. Selling, general and administrative expenses are not completely separately allocated among light industrial services and professional staffing services. Unallocated corporate expenses primarily include, corporate legal expenses, consulting expenses, corporate payroll, audit fees, corporate rent and facility costs, board fees and interest expense. Three Months Ended Six Months Ended March 31, March 31, (In Thousands) 2017 2016 2017 2016 Industrial Staffing Services Industrial services revenue $ 6,125 $ 4,874 $ 12,106 $ 10,874 Industrial services gross margin 13.7 % 10.8 % 15.0 % 11.3 % Operating income (loss) $ 249 $ (27 ) $ 589 $ 40 Depreciation &amp; amortization 68 87 141 138 Accounts receivable ? net 3,644 2,116 3,644 2,116 Intangible assets 800 1,014 800 1,014 Goodwill 1,084 1,084 1,084 1,084 Total assets $ 8,269 $ 6,629 $ 8,269 $ 6,629 Professional Staffing Services Permanent placement revenue $ 1,459 $ 2,059 $ 2,609 $ 3,685 Placement services gross margin 100 % 100 % 100 % 100 % Professional services revenue $ 13,965 $ 14,733 $ 27,840 $ 24,732 Professional services gross margin 24.1 % 19.9 % 24.0 % 23.9 % Operating income $ 1,068 $ 1,118 $ 2,116 $ 2,254 Depreciation and amortization 372 424 747 776 Accounts receivable ? net 9,455 8,839 9,455 8,838 Intangible assets 9,556 10,653 9,556 10,653 Goodwill 17,506 17,108 17,506 17,109 Total assets $ 37,391 $ 38,659 $ 37,391 $ 38,659 Unallocated Expenses Corporate administrative expenses $ 634 $ 429 $ 1,235 $ 1,041 Corporate facility expenses 69 50 143 102 Stock option amortization expense 191 230 385 392 Board related expenses 19 0 38 0 Acquisition, integration and restructuri