Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	[1]
Current assets:
Cash and cash equivalents	$ 17,884,000	$ 23,292,000
Accounts receivable, net of allowance for doubtful accounts of $76,000 as of March 31, 2021 and $71,000 as of December 31, 2020	6,748,000	8,132,000
Accounts receivable, related party	1,275,000	905,000
Inventories, net	18,778,000	16,749,000
Prepaid expenses	10,235,000	6,225,000
Total current assets	54,920,000	55,303,000
Property and equipment, net	4,287,000	4,353,000
Goodwill	55,000	55,000
Definite-lived intangible assets, net	6,000	7,000
Right-of-use assets	3,315,000	3,535,000
Equity investment in unconsolidated affiliate	5,871,000	5,549,000
Total assets	68,454,000	68,802,000
Current liabilities:
Accounts payable	1,219,000	1,983,000
Accrued liabilities	1,762,000	2,793,000
Customer advance payments of orders	113,000	209,000
Lease liabilities	871,000	867,000
Total current liabilities	3,965,000	5,852,000
Lease liabilities, net of current portion	2,496,000	2,719,000
Deferred income tax liabilities, net	211,000	211,000
Total liabilities	6,672,000	8,782,000
Commitments
Shareholders' equity:
Common stock, $.01 par value: 50,000,000 shares authorized; 13,323,341 and 13,419,847 shares outstanding as of March 31, 2021 and December 31, 2020, respectively	134,000	135,000
Additional paid-in capital		409,000
Retained earnings	61,648,000	59,476,000
Total shareholders' equity	61,782,000	60,020,000
Total liabilities and shareholders' equity	$ 68,454,000	$ 68,802,000

[1] The condensed consolidated balance sheet as of December 31, 2020 has been prepared using information from the audited consolidated balance sheet as of that date.