CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 23,819	$ 20,567	$ 17,453
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,369	770	660
Share based compensation	1,935	1,612	1,481
Discontinued project costs			1,714
Deferred income taxes	1,951	(23)	157
Bad debt expense	421	260	94
(Increase) decrease in operating assets and increase (decrease) in liabilities:
Accounts receivable	(505)	(53)	(264)
Inventories - finished goods	5,358	(518)	10,659
Prepaid income taxes	243	(243)	54
Prepaid expenses and other current assets	1,416	(1,055)	662
Accounts payable	10,217	(149)	(616)
Accrued expenses and other current liabilities	321	(65)	(61)
Income taxes payable	659	(50)	50
Net cash provided by operating activities	47,204	21,053	32,043
Cash flows from investing activities:
Proceeds from sale of short term investments		15,591
Net change in investments		54	(68)
Purchases of property and equipment	(10,604)	(20,130)	(918)
Net cash used in investing activities	(10,604)	(4,485)	(986)
Cash flows from financing activities:
Dividends paid	(15,509)	(14,684)	(13,807)
Excess tax benefit related to stock compensation		142	58
Net cash used in financing activities	(15,509)	(14,542)	(13,749)
Net increase in cash and cash equivalents	21,091	2,026	17,308
Cash and cash equivalents, at beginning of year	37,639	35,613	18,305
Cash and cash equivalents, at end of year	58,730	37,639	35,613
Supplemental disclosure of cash flow information:
Cash paid for income taxes	11,373	12,173	10,026
Dividends payable in accrued expenses	$ 217	$ 143	$ 212