Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Current assets:
Cash and cash equivalents	$ 68,443	$ 58,730
Accounts receivable, less allowance for doubtful accounts of $31 and $27, respectively	2,012	1,808
Inventories - finished goods	23,005	20,228
Prepaid expenses and other current assets	1,106	1,019
Total current assets	94,566	81,785
Noncurrent assets:
Property and equipment, net	29,456	30,164
Intangible assets	860	860
Total noncurrent assets	30,316	31,024
Total assets	124,882	112,809
Current liabilities:
Accounts payable	10,376	15,221
Accrued expenses and other current liabilities	2,871	2,475
Income taxes payable	6,008	659
Total liabilities	19,255	18,355
Deferred tax liabilities	1,304	1,088
Total liabilities	20,559	19,443
Commitments and contingencies
Shareholders' equity:
Preferred stock, $.001 par value, 5,000 shares authorized; 3 convertible shares issued and outstanding with a liquidation preference of $4 per share	9	9
Common stock, $.001 par value, 40,000 shares authorized; 20,604 and 20,526 shares issued and outstanding, respectively	21	21
Additional paid-in capital	7,952	6,806
Retained earnings	96,341	86,530
Total shareholders' equity	104,323	93,366
Total liabilities and shareholders' equity	$ 124,882	$ 112,809