Note 10 - Income Taxes - Income Tax Effects of Temporary Differences That Comprise Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Equity method investment	$ 448	$ 400
Goodwill	916	456
Right of use asset	148	146
Other accrued expenses	22	7
Notes receivable fair value adjustment	708	708
Employee benefits	0	2
Capital loss carryforward	11	11
Bad debt expense	0	55
Net operating loss	7,582	7,354
Gross non-current deferred tax assets	9,835	9,139
Property, plant, and equipment	(24)	(39)
Non-taxable dividends	(664)	(664)
Lease liability	(150)	(148)
Gain on remeasurement of acquisition	(847)	(847)
Valuation allowance	(8,150)	(7,441)
Gross non-current deferred tax liabilities	(9,835)	(9,139)
Net noncurrent deferred tax assets	$ 0	$ 0