Note 6 - Income Taxes - Income Tax Effects of Temporary Differences That Comprise Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Noncurrent deferred tax assets:
Equity method investment	$ 195	$ 99
Other accrued expenses	33	32
Notes receivable fair value adjustment	319	578
Employee benefits	50	65
Capital loss carryforward	11
AMT credit		247
Net operating loss	7,861	7,726
Gross non-current deferred tax assets	8,469	8,747
Property, tax, and equipment	(1)	(1)
Non-taxable dividends	(193)
Valuation allowance	(8,275)	(8,499)
Gross non-current deferred tax liabilities	(8,469)	(8,500)
Net noncurrent deferred tax assets		$ 247