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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net income $ 7,626,000 $ 7,508,000
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation 894,000 715,000
Amortization of intangible assets 145,000 145,000
Amortization of debt issuance costs 213,000 171,000
Amortization of interest on accrued core payment 143,000 191,000
Gain due to change in fair value of the warrant liability (1,293,000) (5,589,000)
Gain due to the change in the fair value of the contingent consideration 0 (16,000)
Net provision for inventory reserves 1,286,000 394,000
Net provision for customer payment discrepancies 284,000 189,000
Net (recovery of) provision for doubtful accounts (9,000) 7,000
Deferred income taxes (103,000) (953,000)
Share-based compensation expense 834,000 729,000
Loss on disposal of plant and equipment 6,000 0
Change in operating assets and liabilities:    
Accounts receivable 16,038,000 (2,796,000)
Inventory (14,942,000) (15,422,000)
Inventory unreturned (120,000) 121,000
Prepaid expenses and other current assets 421,000 (2,163,000)
Other assets 608,000 (4,941,000)
Accounts payable and accrued liabilities (5,254,000) 7,630,000
Customer finished goods returns accrual (3,790,000) (2,830,000)
Long-term core inventory (2,878,000) (2,975,000)
Accrued core payment (3,077,000) 1,638,000
Other liabilities 2,324,000 4,408,000
Net cash used in operating activities (644,000) (13,839,000)
Cash flows from investing activities:    
Purchase of plant and equipment (597,000) (1,568,000)
Change in short-term investments (173,000) (133,000)
Net cash used in investing activities (770,000) (1,701,000)
Cash flows from financing activities:    
Borrowings under revolving loan 17,000,000 15,000,000
Repayments under revolving loan (13,000,000) (1,000,000)
Repayments of term loan (782,000) (782,000)
Payments for debt issuance costs (398,000) (382,000)
Payments on capital lease obligations (190,000) (83,000)
Exercise of stock options 295,000 987,000
Cash used to net share settle equity awards (488,000) (350,000)
Repurchase of common stock, including fees (1,979,000) 0
Net cash provided by financing activities 458,000 13,390,000
Effect of exchange rate changes on cash and cash equivalents 47,000 (30,000)
Net decrease in cash and cash equivalents (909,000) (2,180,000)
Cash and cash equivalents - Beginning of period 9,029,000 21,897,000
Cash and cash equivalents - End of period 8,120,000 19,717,000
Cash paid during the period for:    
Interest, net 2,964,000 2,423,000
Income taxes, net of refunds 249,000 70,000
Non-cash investing and financing activities:    
Plant and equipment acquired under capital lease $ 46,000 $ 40,000