Summary of Significant Accounting Policies - Schedule of Calculation of Basic and Diluted EPS (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net loss attributable to S&W Seed Company	$ (6,664,857)	$ (2,766,056)	$ (11,590,347)	$ (2,745,125)
Numerator for basis EPS	(6,664,857)	(2,766,056)	(11,590,347)	(2,745,125)
Effect of dilutive securities:
Warrants	0	0	0	0
Total effect of dilutive securities:	0	0	0	0
Numerator for diluted EPS	$ (6,664,857)	$ (2,766,056)	$ (11,590,347)	$ (2,745,125)
Denominator:
Denominator for basic EPS-weighted- average shares	33,301,578	29,153,852	33,294,344	26,996,483
Effect of dilutive securities:
Employee stock options	0	0	0	0
Employee restricted stock units	0	0	0	0
Warrants	0	0	0	0
Dilutive potential common shares	0	0	0	0
Denominator for diluted EPS - adjusted weighted average shares and assumed conversions	33,301,578	29,153,852	33,294,344	26,996,483
Basic EPS	$ (0.20)	$ (0.09)	$ (0.35)	$ (0.10)
Diluted EPS	$ (0.20)	$ (0.09)	$ (0.35)	$ (0.10)