Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash	$ 9,681,000	$ 5,495,000
Investments	656,000	2,840,000
Accounts receivable, net of allowance for doubtful accounts of $46,000 and $60,000 as of December 31, 2015 and 2014, respectively	2,762,000	5,333,000
Accounts receivable, related party	8,000	333,000
Inventories	16,398,000	16,544,000
Prepaid expenses	3,092,000	4,472,000
Deferred income tax assets	484,000	486,000
Total current assets	33,081,000	35,503,000
Property and equipment, net	2,907,000	3,315,000
Goodwill	55,000	55,000
Definite-lived intangible assets, net	51,000	71,000
Equity investments in unconsolidated affiliate	3,040,000	3,008,000
Total assets	39,134,000	41,952,000
Current liabilities:
Accounts payable	1,027,000	1,099,000
Accrued liabilities	1,128,000	1,195,000
Total current liabilities	2,155,000	2,294,000
Deferred income tax liabilities	867,000	1,752,000
Total liabilities	$ 3,022,000	$ 4,046,000
Commitments (Notes 9 and 12)
Shareholders' equity:
Common stock, $.01 par value: 50,000,000 shares authorized; 17,850,456 and 18,348,556 shares outstanding as of December 31, 2015 and 2014, respectively	$ 178,000	$ 183,000
Additional paid-in capital	16,526,000	17,833,000
Accumulated other comprehensive income (loss)	(148,000)	1,375,000
Retained earnings	19,556,000	18,515,000
Total shareholders' equity	36,112,000	37,906,000
Total liabilities and shareholders' equity	$ 39,134,000	$ 41,952,000