Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 87,132	$ 77,936
Accounts receivable, less allowance for doubtful accounts of $37 and $35, respectively	1,786	2,292
Inventories - finished goods	28,616	23,337
Prepaid expenses and other current assets	976	882
Prepaid income taxes	618	788
Total current assets	119,128	105,235
Noncurrent assets:
Property and equipment, net	28,083	28,741
Intangible assets	860	860
Total noncurrent assets	28,943	29,601
Total assets	148,071	134,836
Current liabilities:
Accounts payable	14,278	15,274
Accrued expenses and other current liabilities	2,767	2,835
Total current liabilities	17,045	18,109
Deferred tax liabilities	1,185	996
Total liabilities	18,230	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	10,881	9,381
Retained earnings	118,930	106,320
Total shareholders' equity	129,841	115,731
Total liabilities and shareholders' equity	$ 148,071	$ 134,836