Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 94,561	$ 77,936
Accounts receivable, less allowance for doubtful accounts of $37 and $35, respectively	2,431	2,292
Inventories - finished goods	25,046	23,337
Prepaid expenses and other current assets	1,278	882
Prepaid income taxes		788
Total current assets	123,316	105,235
Noncurrent assets:
Property and equipment, net	28,491	28,741
Intangible assets	860	860
Total noncurrent assets	29,351	29,601
Total assets	152,667	134,836
Current liabilities:
Accounts payable	21,182	15,274
Accrued expenses and other current liabilities	3,526	2,835
Income taxes payable	3,247
Total current liabilities	27,955	18,109
Deferred tax liabilities	831	996
Total liabilities	28,786	19,105
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; 20,601 and 20,601 shares issued and outstanding, respectively	21	21
Additional paid-in capital	10,100	9,381
Retained earnings	113,751	106,320
Total shareholders' equity	123,881	115,731
Total liabilities and shareholders' equity	$ 152,667	$ 134,836