Note 14 - Stockholders Equity (Details Textual) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 15, 2021 USD ($) $ / shares shares	Nov. 30, 2017	Nov. 30, 2010	Mar. 31, 2022 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 09, 2020 $ / shares	Oct. 04, 2019 shares
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares				$ 0.0001		$ 0.0001	$ 0.0001
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				43,474,364		40,931,857
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 | $				$ 1	$ 157
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares				$ 1.38	$ 2.37
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				125,745		212,650
The 2019 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) | shares								450,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | shares				1,104,291		376,414
Share-based Compensation Arrangement by Share-based Payment Award, Increase in Authorized Shares, Percentage of Outstanding Stock Maximum						4.00%
Common Stock [Member]
Proceeds from Issuance of Private Placement | $	12,074
The 2021 Private Placement [Member]
Proceeds from Issuance of Private Placement | $	16,999
Payments of Stock Issuance Costs | $	$ 259
The 2021 Private Placement [Member] | Common Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	9,808,418
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.0001
Common Stock [Member] | The 2021 Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares						9,808,418
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares						$ 0.0001
Convertible Preferred Stock [Member] | The 2021 Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares						3,790,755
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares						$ 0.0001
Preferred Stock, Convertible, Shares Issuable (in shares) | shares						3,790,755
Series A Preferred Stock [Member]
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, Ending Balance (in shares) | shares						3,790,755
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						$ 1.25
Shares Issued, Price Per Share (in dollars per share) | $ / shares						$ 1.29
Adjustments to Additional Paid in Capital, Convertible Preferred Stock with Beneficial Conversion Feature | $						$ 152
Series A Preferred Stock [Member] | The 2021 Private Placement [Member]
Stock Issued During Period, Shares, New Issues (in shares) | shares	3,790,755
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.0001