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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:      
Net income (loss) $ 7,484 $ (2,962) [1] $ 11,183 [1]
Adjustments to reconcile net income to net cash and cash equivalents provided by operating activities:      
Depreciation and amortization 9,428 9,471 [1] 8,737 [1]
Stock-based compensation 4,212 1,672 [1] 1,411 [1]
Impairment loss on goodwill and long-lived assets 4,774 13,819 [1] [1]
Change in inventory reserve (380) 2,474 [1] 194 [1]
Gain on disposition of assets (288) (116) [1] [1]
Deferred taxes (2,472) (2,704) [1] (630) [1]
Foreign currency adjustments (108) (490) [1] 93 [1]
Adjustment to contingent consideration (32) 300 [1] [1]
Other 45 110 [1] [1]
Cash provided by changes in operating assets and liabilities:      
Accounts receivable, net 1,592 680 [1] 994 [1]
Inventories, net 2,574 2,286 [1] 101 [1]
Prepaid expenses and other current assets (2,898) 755 [1] (830) [1]
Accounts payable 1,092 212 [1] (655) [1]
Accrued liabilities and taxes payable 5,477 408 [1] (3,066) [1]
Unearned revenues 54 (196) [1] (228) [1]
Net cash provided by operating activities 30,554 25,719 [1] 17,304 [1]
Cash flows from investing activities:      
Acquisitions (4,840) (15,518) [1] (6,800) [1]
Proceeds from sale of assets 2,222 1,133 [1] [1]
Purchases of property, plant and equipment (1,262) (2,799) [1] (11,605) [1]
Net cash used in investing activities (3,880) (17,184) [1] (18,405) [1]
Cash flows from financing activities:      
Proceeds from the issuance of debt 2,000 11,000 [1] 66,550 [1]
Payments on debt (25,625) (19,625) [1] (57,000) [1]
Contingent consideration (680) (905) [1] (9,554) [1]
Dividends (2,462) (2,413) [1] (2,355) [1]
Proceeds from the exercise of stock options 5,095 2,919 [1] 3,513 [1]
Net cash (used in) provided by financing activities (21,672) (9,024) [1] 1,154 [1]
Effect of exchange rate changes on cash and cash equivalents (286) 138 [1] 72 [1]
Net increase (decrease) in cash and cash equivalents 4,716 (351) [1] 125 [1]
Cash and cash equivalents at the beginning of the year [1] 5,469 5,820 5,695
Cash and cash equivalents at the end of the year 10,185 5,469 [1] 5,820 [1]
Cash paid for:      
Income taxes paid 5,870 4,551 [1] 5,605 [1]
Interest paid $ 1,637 $ 1,956 [1] $ 1,384 [1]
[1] Contingent consideration has been reclassified to align with current year presentation.