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Note 14 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Balances			$ 35,184,039
Share-based compensation expense			$ 284,250
Issuance of common stock upon exercise of stock options, net (in shares)			110,852
Issuance of common stock upon exercise of stock options, net			$ 185,718
Issuance of common stock upon vesting of restricted stock units
Other comprehensive loss			(12,513)
Net (loss)	$ 460,908	$ 298,350	(1,222,344)	$ (514,329)
Balances	$ 34,419,150		$ 34,419,150
Common Stock [Member]
Balances (in shares)			32,158,436
Balances			$ 322
Issuance of common stock upon exercise of stock options, net (in shares)			110,852
Issuance of common stock upon vesting of restricted stock units (in shares)			125,000
Issuance of common stock upon vesting of restricted stock units
Balances (in shares)	32,394,288		32,394,288
Balances	$ 322		$ 322
Additional Paid-in Capital [Member]
Balances			87,956,839
Share-based compensation expense			284,250
Issuance of common stock upon exercise of stock options, net			185,718
Issuance of common stock upon vesting of restricted stock units
Balances	88,426,807		88,426,807
Retained Earnings [Member]
Balances			(52,771,853)
Issuance of common stock upon vesting of restricted stock units
Net (loss)			(1,222,344)
Balances	(53,994,197)		(53,994,197)
AOCI Attributable to Parent [Member]
Balances			(1,269)
Issuance of common stock upon vesting of restricted stock units
Other comprehensive loss			(12,513)
Balances	$ (13,782)		$ (13,782)

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