Note 10 - Segment Reporting - Income From Operations (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment profit	$ 349,000	$ (187,000)	$ 3,610,000	$ 1,828,000
Sales, general, and administrative	(1,188,000)	(882,000)	(2,420,000)	(2,386,000)
Gain on disposal of assets	23,000	175,000	23,000	175,000
Impairment loss	0	(250,000)	0	(250,000)
Depreciation and amortization	(288,000)	(945,000)	(1,056,000)	(1,916,000)
Operating Income (Loss)	$ (1,104,000)	$ (2,089,000)	$ 157,000	$ (2,549,000)