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Note 12 - Stockholders' Equity (Details Textual)		1 Months Ended			3 Months Ended		9 Months Ended
	Feb. 15, 2021 shares	Sep. 30, 2021 USD ($) $ / shares shares	May 31, 2021 USD ($) shares	Feb. 28, 2021 USD ($) shares	Sep. 30, 2021 $ / shares shares	Sep. 30, 2020 shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) shares
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)							2,005,258
Stock Issued During Period, Value, Warrant Exercised | $							$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)							347,901
Proceeds from Issuance of Common Stock | $							$ 9,331,000	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)					0	0	0	0
Restricted Stock Units (RSUs) [Member] | February 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				25,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value | $				$ 151,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)							0
LiNiCo [Member]
Stock Issued During Period, Shares, Equity Method Invesment (in shares)	375,000						375,000
Board Members [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)							95,491
Board Members [Member] | Restricted Stock Units (RSUs) [Member] | May 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			81,883
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value | $			$ 235,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)							34,118
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments			12
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			1 year
Employee [Member] | Restricted Stock Units (RSUs) [Member] | September 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		12,111
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value | $		$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)							0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Number of Installments		6
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
First Cashless Exercise of Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		10,350			10,350		10,350
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1.90			$ 1.90		$ 1.90
Second Cashless Exercise of Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		86,778			86,778		86,778
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares		$ 1.90			$ 1.90		$ 1.90
First Set of Common Stock Pursuant to Cashless Exercise of Warrant [Member]
Share Price (in dollars per share) | $ / shares		3.95			3.95		$ 3.95
Stock Issued During Period, Value, Warrant Exercised | $							$ 5,371
Second Set of Common Stock Pursuant to Cashless Exercise of Warrant [Member]
Share Price (in dollars per share) | $ / shares		$ 6.20			$ 6.20		$ 6.20
Stock Issued During Period, Value, Warrant Exercised | $							$ 60,219
ATM [Member]
Stock Issued During Period, Shares, New Issues (in shares)							2,473,359
Proceeds from Issuance of Common Stock | $							$ 9,300,000

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