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Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 22, 2022	Jan. 01, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Stock, Shares Authorized	350,000,000	350,000,000		350,000,000
Cash and Cash Equivalents, at Carrying Value, Total	$ 4,177,000			$ 7,280,000
Inventory, Noncurrent, Total	1,003,000			1,709,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Payments	0
Unrecognized Tax Benefits, Ending Balance	0			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	3,323,000			3,397,000	$ 5,870,000
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	(266,193,000)			(264,662,000)	(253,283,000)
Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	270,377,000			268,459,000	$ 259,067,000
Accounting Standards Update 2020-06 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance				(942,000)
Accounting Standards Update 2020-06 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Convertible Debt [Member]
Debt Instrument, Unamortized Discount, Total			$ 942,000
Accounting Standards Update 2020-06 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance			9,739,000	9,739,000
Accounting Standards Update 2020-06 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Additional Paid-in Capital [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance			$ 10,681,000	(10,681,000)
INDIA
Cash and Cash Equivalents, at Carrying Value, Total	$ 47,000			$ 87,000
CAR-TXpress [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	20.00%
Noncontrolling Interest, Ownership Percentage by Parent	80.00%