Note 15 - Stockholders Equity (Details Textual) $ / shares in Units, $ in Thousands				1 Months Ended				3 Months Ended		9 Months Ended	12 Months Ended		24 Months Ended	33 Months Ended
	Nov. 18, 2022 shares	Jul. 12, 2022 USD ($) $ / shares shares	Dec. 15, 2021 USD ($) $ / shares shares	Nov. 30, 2022 USD ($) $ / shares shares	Jul. 31, 2022 USD ($) shares	Nov. 30, 2017	Nov. 30, 2010	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares	Mar. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Mar. 31, 2023 $ / shares shares	Jul. 13, 2022 $ / shares	Dec. 09, 2020 $ / shares	Jun. 16, 2020 USD ($) $ / shares shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares								$ 0.0001		$ 0.0001	$ 0.0001			$ 0.0001		$ 0.0001
Proceeds from Issuance of Common Stock								$ 803	$ 0
Stock Issued During Period, Value, New Issues								$ 745
Proceeds from Issuance of Private Placement			$ 16,740
Adjustments to Additional Paid in Capital, Convertible Preferred Stock with Beneficial Conversion Feature			$ 152
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares								6,337,465		6,337,465	6,378,307			6,337,465
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments								$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value								$ 0	$ 1
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares								$ 2.82	$ 20.70
The 2010 Share Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)						10 years	7 years
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares								3,393		3,393	6,283			3,393
The 2019 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares								30,000		30,000				30,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares								68,239		68,239	18,796			68,239
Share-based Compensation Arrangement by Share-based Payment Award, Increase in Authorized Shares, Percentage of Outstanding Stock Maximum								4.00%
Series A Preferred Stock [Member]
Shares Issued, Price Per Share (in dollars per share) | $ / shares												$ 19.35
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.0001
Proceeds from Issuance of Private Placement			$ 4,514
Preferred Stock, Shares Outstanding (in shares) | shares												252,717
Preferred Stock, Convertible, Conversion Ratio												1
Preferred Stock, Maximum Conversion Cap Percentage												9.99%
Dividends Payable												$ 0
Preferred Stock, Convertible, Conversion Price (in dollars per share) | $ / shares												$ 18.75
Adjustments to Additional Paid in Capital, Convertible Preferred Stock with Beneficial Conversion Feature												$ 152
Voting Preferred Stock [Member]
Preferred Stock, Convertible, Conversion Ratio				10
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares				$ 30.00
Preferred Stock, Convertible, Volume Weighted Average Price Per Common Share (in dollars per share) | $ / shares				$ 18.75
Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares								224,386
Stock Issued During Period, Value, New Issues								$ 1
Proceeds from Issuance of Private Placement			12,074
Preferred Stock [Member]
Preferred Stock, Shares Outstanding (in shares) | shares								2,123,333		2,123,333	2,123,333			2,123,333
Preferred Stock [Member] | Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares								0
Stock Issued During Period, Value, New Issues								$ 0
Preferred Stock [Member] | Voting Preferred Stock [Member] | Chief Executive Officer, President, Chief Innovation and Business Officer, and Certain Members of the Board [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	212,333
Equity Purchase Agreement [Member] | Lincoln Park [Member]
Equity Purchase Agreement, Maximum Offering Amount																	$ 31,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares																	$ 0.0001
Equity Purchase Agreement, Maximum Shares Issuable (in shares) | shares																	517,560
Equity Agreement, Maximum Percentage of Stock Outstanding																	19.99%
Equity Agreement, Minimum Average Purchase Price (in dollars per share) | $ / shares																	$ 59.6325
Maximum Percentage of Outstanding Stock, Beneficial Ownership																	9.99%
Stock Issued During Period, Shares, New Issues (in shares) | shares					20,000.00						26,666,000			229,139
Shares Issued, Price Per Share (in dollars per share) | $ / shares								$ 40.50		$ 40.50				$ 40.50
Stock Issued During Period, Shares, Commitment Fee (in shares) | shares														13,971
Stock Issued During Period, Value, Commitment Fee													$ 620
Deferred Offering Costs											$ 0		$ 123
Proceeds from Issuance of Common Stock					$ 300						$ 272
LPC Purchase Agreement 2022 [Member] | Lincoln Park [Member]
Equity Purchase Agreement, Maximum Offering Amount		$ 11,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares		$ 0.0001
Equity Purchase Agreement, Maximum Shares Issuable (in shares) | shares		858,224
Equity Agreement, Maximum Percentage of Stock Outstanding		19.99%
Maximum Percentage of Outstanding Stock, Beneficial Ownership		9.99%
Stock Issued During Period, Shares, New Issues (in shares) | shares		50,000.00						224,386		660,000	433,333
Shares Issued, Price Per Share (in dollars per share) | $ / shares								$ 3.58		$ 3.58	$ 4.54			$ 3.58	$ 4.20
Stock Issued During Period, Shares, Commitment Fee (in shares) | shares		45,701
Stock Issued During Period, Value, Commitment Fee		$ 330
Stock Issued During Period, Value, New Issues		$ 300						$ 803		$ 2,800	$ 1,970
The 2021 Private Placement [Member]
Proceeds from Issuance of Private Placement			17,000
Payments of Stock Issuance Costs			$ 300
The 2021 Private Placement [Member] | Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares			252,717
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares			$ 0.0001
The 2021 Private Placement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares			653,894
The 2022 Private Placement [Member]
Proceeds from Issuance of Private Placement				$ 6,720
Payments of Stock Issuance Costs				$ 202
The 2022 Private Placement [Member] | Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares				212,333
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.0001
Preferred Stock, Convertible, Shares Issuable (in shares) | shares				2,123,333
The 2022 Private Placement [Member] | Common Stock [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.0001
Stock Issued During Period, Shares, New Issues (in shares) | shares				116,666