ACCOUNTS RECEIVABLE - TRADE (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
ACCOUNTS RECEIVABLE - TRADE
Accounts receivable - trade	$ 31,053,000	$ 21,768,000
Allowance for doubtful accounts	(405,000)	(473,000)
Allowance for sales returns and volume rebates	(1,075,000)	(426,000)
Accounts receivable - trade, net of allowances	29,573,000	$ 20,869,000
Write-offs of accounts receivable	$ 524,700