Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 17,365,000	$ 6,548,000
Investments	228,000	335,000
Accounts receivable, net of allowance for doubtful accounts of $53,000 as of March 31, 2020 and December 31, 2019	7,362,000	3,568,000
Accounts receivable, related party	916,000	724,000
Inventories	11,148,000	11,303,000
Right-of-use assets	906,000	898,000
Prepaid expenses	4,237,000	3,587,000
Total current assets	42,162,000	26,963,000
Property and equipment, net	4,050,000	3,943,000
Goodwill	55,000	55,000
Definite-lived intangible assets, net	10,000	11,000
Right-of-use assets, net of current portion	2,048,000	2,280,000
Equity investment in unconsolidated affiliate	4,926,000	4,839,000
Total assets	53,251,000	38,091,000
Current liabilities:
Accounts payable	1,727,000	501,000
Accrued liabilities	764,000	920,000
Customer advance payments of orders	7,161,000
Lease liabilities	886,000	882,000
Total current liabilities	10,538,000	2,303,000
Lease liabilities, net of current portion	2,113,000	2,337,000
Deferred income tax liabilities, net	224,000	224,000
Total liabilities	12,875,000	4,864,000
Commitments
Shareholders' equity:
Common stock, $.01 par value: 50,000,000 shares authorized; 13,563,012 and 13,502,684 shares outstanding as of March 31, 2020 and December 31, 2019, respectively	136,000	129,000
Additional paid-in capital	2,508,000	708,000
Retained earnings	37,732,000	32,390,000
Total shareholders' equity	40,376,000	33,227,000
Total liabilities and shareholders' equity	$ 53,251,000	$ 38,091,000