Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
Cash flows from operating activities:
Net (loss) income	$ 3,513,000	$ 5,595,000	$ 7,820,000	$ (1,982,000)	$ 13,415,000
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation				2,834,000	1,828,000
Amortization of intangible assets	192,000	180,000		384,000	325,000
Amortization and write-off of debt issuance costs				647,000	426,000
Amortization of interest on contract liabilities, net				513,000	269,000
Gain due to change in fair value of the warrant liability				0	(2,313,000)
Gain on short-term investments	(111,000)			(180,000)	0
Net provision for inventory reserves				5,285,000	3,258,000
Net provision for customer payment discrepancies				274,000	604,000
Net provision for (recovery of) doubtful accounts				206,000	(2,000)
Deferred income taxes			209,000	(667,000)	(207,000)
Share-based compensation expense				2,121,000	1,744,000
Loss on disposal of plant and equipment				11,000	7,000
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable			9,333,000	6,598,000	2,819,000
Inventory			(18,494,000)	(32,380,000)	(28,552,000)
Inventory unreturned				(1,592,000)	(123,000)
Income tax receivable				(3,595,000)	(3,985,000)
Prepaid expenses and other current assets				(658,000)	(2,645,000)
Other assets			(1,000)	(79,000)	(20,000)
Accounts payable and accrued liabilities				17,840,000	(3,764,000)
Customer finished goods returns accrual				2,156,000	(4,246,000)
Contract assets, net			1,726,000	(8,773,000)	6,882,000
Contract liabilities, net			3,172,000	2,724,000	5,837,000
Other liabilities				1,904,000	295,000
Net cash used in operating activities			(644,000)	(6,409,000)	(8,148,000)
Cash flows from investing activities:
Purchase of plant and equipment				(5,259,000)	(2,460,000)
Purchase of business, net of cash acquired				0	(4,974,000)
Change in short-term investments				(222,000)	(226,000)
Net cash used in investing activities				(5,481,000)	(7,660,000)
Cash flows from financing activities:
Borrowings under revolving loan				35,200,000	52,000,000
Repayments of revolving loan				(36,294,000)	(27,000,000)
Borrowings under term loan				13,594,000	0
Repayments of term loan				(782,000)	(1,563,000)
Payments for debt issuance costs				(1,757,000)	(443,000)
Payments on capital lease obligations				(711,000)	(392,000)
Exercise of stock options				244,000	295,000
Cash used to net share settle equity awards				(320,000)	(594,000)
Settlement of warrant				0	4,000,000
Repurchase of common stock, including fees				(4,062,000)	(4,476,000)
Net cash provided by financing activities				5,112,000	21,827,000
Effect of exchange rate changes on cash and cash equivalents				(96,000)	42,000
Net (decrease) increase in cash and cash equivalents				(6,874,000)	6,061,000
Cash and cash equivalents - Beginning of period			$ 9,029,000	13,049,000	9,029,000	$ 9,029,000
Cash and cash equivalents - End of period	$ 6,175,000	$ 15,090,000		6,175,000	15,090,000	$ 13,049,000
Cash paid during the period for:
Interest, net				9,534,000	6,121,000
Income taxes, net of refunds				3,263,000	11,672,000
Non-cash investing and financing activities:
Plant and equipment acquired under capital lease				$ 0	$ 498,000