Note 12 - Stockholders' Equity (Deficit) (Details Textual) - USD ($)							1 Months Ended			3 Months Ended
	Mar. 06, 2020	Oct. 09, 2019	Sep. 05, 2019	Aug. 08, 2019	Jun. 26, 2019	Mar. 29, 2019	Aug. 31, 2019	Jul. 31, 2019	Jun. 30, 2019	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2019	Aug. 13, 2019	May 31, 2019	Feb. 29, 2016	Oct. 27, 2015	Jul. 31, 2011
Preferred Stock, Shares Authorized (in shares)										5,000,000					5,000,000
Preferred Stock, Shares Outstanding, Ending Balance (in shares)										0					0
Stock Issued During Period, Shares, New Issues (in shares)				4,198,566							4,198,566
Payments of Stock Issuance Costs				$ 488,000
Common Stock, Par or Stated Value Per Share (in dollars per share)										$ 0.01					$ 0.01
Common Stock, Shares Authorized (in shares)										50,000,000					240,000,000
Proceeds from Issuance of Common Stock				$ 4,200,000
Shares Issued, Price Per Share (in dollars per share)				$ 1															$ 5
Class of Warrant or Right, Issued During Period (in shares)
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)										$ 1.11					$ 1.09					$ 33.25
Additional Paid in Capital, Ending Balance										$ 125,975,000					$ 125,718,000
Class of Warrant or Right, Exercised During Period (in shares)										299,000
Proceeds from Warrant Exercises										$ 201,000
Class of Warrant or Right, Outstanding (in shares)										8,247,000					8,588,000
Conversion of Series A Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)		2,700,000
Conversion of Stock, Shares Issued (in shares)		2,700,000
Triton Funds LP [Member]
Common Stock, Shares Authorized (in shares)						3,000,000
Purchase Price, Percentage of Lowest Trading Price of Common Stock for Five Days Prior to Closing						90.00%
Triton Funds LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)						150,000						1,747,312
Payments of Stock Issuance Costs												$ 122,000
Common Stock, Par or Stated Value Per Share (in dollars per share)									$ 0.01			$ 0.01
Stock Issued During Period, Value, New Issues												$ 360,000
Proceeds from Issuance of Common Stock			$ 288,000
Ladenburg Thalmann and Co. Inc. [Member]
Private Placement, Commission Percentage				6.00%
Payments of Stock Issuance Costs				$ 252,000
Payments of Stock Issuance Costs, Reimbursement of Expenses				60,000
Payments of Stock Issuance Costs, Other				312,000
Private Placement [Member]
Payments of Stock Issuance Costs				33,000	$ 27,000
Payments of Stock Issuance Costs Allocated to Warrants				$ 93,000
Private Placement [Member] | China Kington Asset Management Co. Ltd. [Member]
Private Placement, Commission Percentage				6.00%										6.00%
Payments of Stock Issuance Costs				$ 162,000										$ 359,000
Private Placement [Member] | OP Financial Investments Limited [Member]
Stock Issued During Period, Shares, New Issues (in shares)														1,700,000
Common Stock, Par or Stated Value Per Share (in dollars per share)														$ 0.01
Stock Issued During Period, Value, New Issues														$ 5,984,000
Private Placement [Member] | NYSE American [Member]
Payments of Stock Issuance Costs														$ 34,000
Private Placement [Member] | Three Accredited Investors [Member]
Stock Issued During Period, Shares, New Issues (in shares)					1,371,427
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					1,371,427
Issuance of Stock and Warrants During the Period, Value					$ 2,400,000
Private Placement [Member] | Xiao Rui Liu [Member]
Issuance of Stock and Warrants During the Period, Value					1,000,000
Private Placement [Member] | Hai Dong Pang [Member]
Issuance of Stock and Warrants During the Period, Value					400,000
Private Placement [Member] | Ping Huang [Member]
Issuance of Stock and Warrants During the Period, Value					$ 1,000,000
Private Placement [Member] | China Kington [Member]
Private Placement, Commission Percentage					6.00%
Payments of Stock Issuance Costs					$ 144,000
The 2019 Foreign Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		2,700,000		2,700,000			2,700,000
Warrants and Rights Outstanding				$ 2,000,000						$ 1,504,000						$ 2,000,000
Class of Warrant or Right, Issued During Period (in shares)							2,700,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.15					$ 1.15
Class of Warrant or Right, Outstanding (in shares)										2,700,000
The 2019 Domestic Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				4,198,566			4,198,566
Warrants and Rights Outstanding				$ 3,100,000						$ 2,339,000						$ 3,100,000
Payments of Stock Issuance Costs Allocated to Warrants				$ 233,000
Class of Warrant or Right, Issued During Period (in shares)				4,198,566			4,198,566
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 1.15			$ 1.15									$ 1.15
Common Stock, Closing Price (in dollars per share)				$ 2
Additional Paid in Capital, Ending Balance				$ (255,000)
Class of Warrant or Right, Outstanding (in shares)										4,199,000
The 2019 Ladenburg Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							167,942
Warrants and Rights Outstanding										$ 92,000						$ 124,000
Payments of Stock Issuance Costs Allocated to Warrants				59,000
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs				$ 65,000
Class of Warrant or Right, Issued During Period (in shares)							167,942
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 1.25			$ 1.25									$ 1.25
Class of Warrant or Right, Outstanding (in shares)										168,000
The 2019 Ladenburg Warrants [Member] | Ladenburg Thalmann and Co. Inc. [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				167,942
July 2011, March 2015, and October 2015 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)																	$ 0.2061	$ 1.81
July 2011 and October 2015 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)								102,602	158,400		102,602	158,400
Warrants and Rights Outstanding									$ 400,000		$ 200,000	$ 400,000
Class of Warrant or Right, Exercised During Period (in shares)								102,602			102,602	158,400
Proceeds from Warrant Exercises								$ 21,000			$ 21,000	$ 33,000
March 2015 Short-term and Long-term Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									133,167	70,000		133,167
Class of Warrant or Right, Exercised During Period (in shares)										70,000		133,167
Proceeds from Warrant Exercises										$ 14,000		$ 13,000
Class of Warrant or Right, Exercised During Period, Cashless Exercise (in shares)												70,000
Stock Issued In Connection with Exercise of Warrants, Shares (in shares)												64,979
The June 2019 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)										228,571
Class of Warrant or Right, Exercised During Period (in shares)										228,571
Class of Warrant or Right Call Feature Minimum Stock Price (in dollars per share)									$ 1			$ 1
Adjustments to Additional Paid in Capital, Warrant Issued										$ 199,000
The June 2019 Warrants [Member] | China Kington [Member]
Exercise of Warrants, Commission, Percent										6.00%
Payments for Commission, Exercise of Warrants										$ 12,000
The June 2019 Warrants [Member] | Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)									1,371,427			1,371,427
Class of Warrant or Right, Issued During Period (in shares)									1,371,427
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)									$ 0.87			$ 0.87
Warrants and Rights Outstanding, Term (Month)									1 year			1 year
The July 2011 Warrants [Member]
Warrants and Rights Outstanding										$ 0
Class of Warrant or Right, Expired During Period (in shares)	35,107									35,107
Class of Warrant or Right, Outstanding (in shares)										0
October 2015 Warrants [Member]
Class of Warrant or Right, Expired During Period (in shares)	7,419
Class of Warrant or Right, Outstanding (in shares)										38,000
The March 2015 Warrants [Member]
Class of Warrant or Right, Expired During Period (in shares)	7,419									7,419
Class of Warrant or Right, Outstanding (in shares)										0
Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)				2,700,000
Proceeds from Issuance of Preferred Stock and Preference Stock				$ 2,700,000
Adjustments to Additional Paid in Capital, Beneficial Conversion Feature Upon Issuance of Stock		$ 800,000
Series A Preferred Stock [Member] | Private Placement [Member]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs				$ 102,000