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Note 14 - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Balance					$ 35,184,039
Share-based compensation expense					$ 433,063
Issuance of common stock upon exercise of stock options, net (in shares)					579,653
Issuance of common stock upon exercise of stock options, net					$ 1,027,719
Issuance of common stock upon vesting of restricted stock units
Stock buyback					(500,269)
Other comprehensive loss					(223,939)
Net loss	$ (80,219)	$ (528,163)	$ (1,302,564)	$ (1,042,492)	(1,302,564)	$ (1,042,492)
Balance	$ 34,618,049		$ 34,618,049		$ 34,618,049
Common Stock [Member]
Balance (in shares)					32,158,436
Balance					$ 322
Issuance of common stock upon exercise of stock options, net (in shares)					579,653
Issuance of common stock upon vesting of restricted stock units (in shares)					125,000
Issuance of common stock upon vesting of restricted stock units
Stock buyback (in shares)					(211,326)
Stock buyback					$ 3
Balance (in shares)	32,651,763		32,651,763		32,651,763
Balance	$ 325		$ 325		$ 325
Additional Paid-in Capital [Member]
Balance					87,956,839
Share-based compensation expense					433,063
Issuance of common stock upon exercise of stock options, net					1,027,719
Issuance of common stock upon vesting of restricted stock units
Stock buyback					(500,272)
Balance	88,917,349		88,917,349		88,917,349
Retained Earnings [Member]
Balance					(52,771,853)
Issuance of common stock upon vesting of restricted stock units
Stock buyback
Net loss					(1,302,564)
Balance	(54,074,417)		(54,074,417)		(54,074,417)
AOCI Attributable to Parent [Member]
Balance					(1,269)
Issuance of common stock upon vesting of restricted stock units
Stock buyback
Other comprehensive loss					(223,939)
Balance	$ (225,208)		$ (225,208)		$ (225,208)