Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 7,280,000	$ 7,161,000
Inventory, Noncurrent, Total	1,709,000	1,221,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments	0
Income Tax Examination, Penalties and Interest Accrued, Total	0
Unrecognized Tax Benefits, Ending Balance	0
INDIA
Cash and Cash Equivalents, at Carrying Value, Ending Balance	$ 87,000	$ 83,000
CAR-TXpress [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	20.00%
Noncontrolling Interest, Ownership Percentage by Parent	80.00%

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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