Note 1 - Summary of Significant Accounting Policies - Finite Lived Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets, Net, Ending Balance			$ 501,000	[1]	$ 1,173,000	$ 1,173,000
Additions			43,000			64,000
Amortization	$ 40,000	$ 45,000	111,000		139,000	176,000
Abandonment Loss						560,000
Balance at December 31, 2021	433,000		433,000			501,000	[1]
Customer Relationships [Member]
Finite-Lived Intangible Assets, Net, Ending Balance			360,000		507,000	507,000
Additions			0			0
Amortization			108,000			147,000
Abandonment Loss						0
Balance at December 31, 2021	252,000		252,000			360,000
Trade Names [Member]
Finite-Lived Intangible Assets, Net, Ending Balance			0		589,000	589,000
Additions			0			0
Amortization			0			29,000
Abandonment Loss						560,000
Balance at December 31, 2021	0		0			0
Patents [Member]
Finite-Lived Intangible Assets, Net, Ending Balance			141,000		$ 77,000	77,000
Additions			43,000			64,000
Amortization			3,000			0
Abandonment Loss						0
Balance at December 31, 2021	$ 181,000		$ 181,000			$ 141,000

[1] The condensed consolidated balance sheet at December 31, 2021 has been derived from the audited financial statements at that date