Note 7 - Related Party Transactions - Related Party Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Merchandise and vehicle purchases	$ 28,000	$ 18,000	$ 172,000	$ 123,000
Shared services expense	280,000	280,000	686,000	729,000
Merchandise sales	652,000	874,000	2,186,000	2,413,000
Rent expense	$ 182,000	$ 181,000	$ 544,000	$ 542,000