Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 93,166	$ 77,936
Accounts receivable, less allowance for doubtful accounts of $19 and $35, respectively	1,269	2,292
Inventories - finished goods	32,247	23,337
Prepaid expenses and other current assets	1,266	882
Prepaid income taxes	525	788
Total current assets	128,473	105,235
Noncurrent assets:
Property and equipment, net	27,584	28,741
Intangible assets	860	860
Total noncurrent assets	28,444	29,601
Total assets	156,917	134,836
Current liabilities:
Accounts payable	20,283	15,274
Accrued expenses and other current liabilities	2,769	2,835
Total current liabilities	23,052	18,109
Deferred tax liabilities	1,007	996
Total liabilities	24,059	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; 20,674 and 20,601 shares issued and outstanding, respectively	21	21
Additional paid-in capital	11,693	9,381
Retained earnings	121,135	106,320
Total shareholders' equity	132,858	115,731
Total liabilities and shareholders' equity	$ 156,917	$ 134,836