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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 27, 2017
Aug. 28, 2016
Cash flows from operating activities:    
Consolidated net income $ 2,212 $ 3,345
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization 2,954 2,550
Stock-based compensation expense 950 807
Deferred taxes 1,150 1,727
Change in investment in non-public company, fair value (900)
Net gain on disposal of property and equipment (2) (4)
Changes in current assets and current liabilities:    
Accounts receivable, net (768) 2,256
Inventories (2,849) (4,647)
Prepaid expenses and other current assets (841) (347)
Accounts payable 1,083 709
Accrued compensation (2,825) (1,415)
Other accrued liabilities (269) 1,612
Deferred revenue (26) (126)
Net cash (used in) provided by operating activities (131) 6,467
Cash flows from investing activities:    
Purchases of property and equipment (2,146) (2,131)
Issuance of note receivable (1,185)
Proceeds from sales of fixed assets 43 9
Net cash used in investing activities (3,288) (2,122)
Cash flows from financing activities:    
Proceeds from sale of common stock 1 98
Taxes paid by Company for employee stock plans (43) (272)
Payments on long-term debt (1,271) (1,909)
Proceeds from lines of credit 10,500
Payments on lines of credit (3,000) (3,500)
Other, net 14 (30)
Net cash provided by (used in) financing activities 6,201 (5,613)
Net increase (decrease) in cash and cash equivalents 2,782 (1,268)
Cash and cash equivalents at beginning of period 5,409 9,894
Cash and cash equivalents at end of period $ 8,191 $ 8,626