Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 208,000	$ 66,000
Accounts receivable, net	3,318,000	3,443,000
Inventories, net	8,496,000	7,876,000
Prepaid expenses	646,000	625,000
Other current assets	240,000	464,000
Total current assets	12,908,000	12,474,000
Property, plant and equipment:
Machinery and equipment	17,470,000	17,470,000
Office furniture and equipment	2,076,000	2,076,000
Intellectual property	783,000	783,000
Leasehold improvements	23,000	23,000
Fixtures and equipment at customer locations	518,000	519,000
Projects under construction	255,000	223,000
Property, Plant and Equipment, Gross	21,125,000	21,094,000
Less : accumulated depreciation and amortization	(20,049,000)	(19,951,000)
Total property, plant and equipment, net	1,076,000	1,143,000
Other assets:
Operating lease right-of-use	4,277,000	3,530,000
Other assets	0	135,000
Total other assets	4,277,000	3,665,000
TOTAL ASSETS	18,261,000	17,282,000
Current liabilities:
Trade payables	2,347,000	2,132,000
Line of credit	5,158,000	5,003,000
Notes payable - current portion	229,000	726,000
Notes payable - officers, subordinated	0	1,193,000
Operating Lease Liabilities	500,000	670,000
Accrued liabilities	485,000	647,000
Total current liabilities	8,719,000	10,371,000
Long-term liabilities:
Notes payable - noncurrent	493,000	0
Notes payable - officers, subordinated	1,211,000	0
Operating Lease, Liability, Noncurrent	3,777,000	2,860,000
Total long-term liabilities	5,481,000	2,860,000
TOTAL LIABILITIES	14,200,000	13,231,000
Shareholders' Equity:
Common Stock – no par value, 50,000,000 shares authorized, 5,955,408 and 5,930,408 shares issued and 5,911,750 and 5,886,750 shares outstanding at March 31, 2022 and December 31, 2021, respectively	14,538,000	14,538,000
Paid-in-capital	4,146,000	4,317,000
Accumulated deficit	(22,676,000)	(22,655,000)
Less: Treasury stock, 43,658 shares	(161,000)	(161,000)
Total Shareholders' Equity	4,061,000	4,051,000
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	18,261,000	17,282,000
Series A Preferred Stock [Member]
Shareholders' Equity:
Preferred Stock	3,255,000	3,155,000
Series B Preferred Stock [Member]
Shareholders' Equity:
Preferred Stock	1,749,000	1,715,000
Series C Preferred Stock [Member]
Shareholders' Equity:
Preferred Stock	1,664,000	1,630,000
Series D Preferred Stock [Member]
Shareholders' Equity:
Preferred Stock	$ 1,546,000	$ 1,512,000