Note 6 - Debt (Details Textual) - USD ($)				1 Months Ended	12 Months Ended
	Jan. 13, 2021	Dec. 31, 2020	Jun. 10, 2020	Jan. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Sep. 13, 2021	Jul. 30, 2021	Jun. 29, 2020	Apr. 16, 2020	Mar. 26, 2020	Dec. 31, 2019
Long-term Debt, Total					$ 64,000
Restricted Cash, Total		$ 4,304,000			4,314,000	$ 4,304,000						$ 5,054,000
Gain (Loss) on Extinguishment of Debt, Total				$ 1,400,000	1,384,000	$ (0)
CNC Credit Agreement [Member]
Derivative, Variable Interest Rate		0.25%				0.25%
CNC Credit Agreement [Member]
Debt Instrument, Face Amount											$ 20,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity											$ 20,000,000.0
Primarily Billed Accounts Receivable Due After One Year Highest Interest Rate											85.00%
Unbilled Accounts Receivable											75.00%
Long-term Debt, Total					10,000,000.0
Line of Credit Facility, Remaining Borrowing Capacity					400,000
Restricted Cash, Total		$ 1,000,000.0				$ 1,000,000.0			$ 3,000,000.0
Restricted Cash, Borrowing Limit Percent		97.50%				97.50%
Long-term Line of Credit, Total								$ 1,500,000
Libor Rate Loans Percentage		1.75%				1.75%
Marginal Rate		5.50%				5.50%
CNC Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		5.50%
CNC Credit Agreement [Member] | Other Assets [Member]
Debt Issuance Costs, Net, Total					300,000
Credit Facility Agreement [Member]
Purchaser Becoming a Guarantor								$ 3,000,000.0
Credit Facility Third Amendment [Member]
Line of Credit, Borrowing Base Inventory							$ 3,000,000.00
Line of Credit, Borrowing Base, Percent of Accounts Receivable							85.00%
Line of Credit, Borrowing Base, Purchase Price for Vehicles							80.00%
Credit Facility Third Amendment [Member] | Maximum [Member]
Line of Credit, Minimum Borrowing Usage Requirement Percent							50.00%
Line of Credit, Minimum Borrowing Usage Requirement							$ 10,000,000
Credit Facility Third Amendment [Member] | Minimum [Member]
Line of Credit, Minimum Borrowing Usage Requirement Percent							40.00%
Line of Credit, Minimum Borrowing Usage Requirement							$ 8,000,000
Paycheck Protection Program CARES Act [Member]
Loans Payable, Noncurrent, Total										$ 1,380,000
Gain (Loss) on Extinguishment of Debt, Total	$ 1,380,000
Debt Instrument, Decrease, Forgiveness, Including Accrued Interest	$ 1,390,000
Financing Agreement [Member]
Due to Related Parties, Current, Total			$ 200,000
Payments to Acquire Furniture and Fixtures			$ 5,300		$ 100,000