Note 12 - Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details)	Sep. 30, 2017 USD ($)
Net Operating Loss	$ 3,029,882
Research & Development & Other Tax Credits [Member]
R&D & Other Credits	2,179,462
Expires in Tax Year 2018 [Member]
Net Operating Loss
Expires in Tax Year 2018 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	44,980
Expires in Tax Year 2019 [Member]
Net Operating Loss
Expires in Tax Year 2019 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	166,019
Expires in Tax Year 2020 [Member]
Net Operating Loss
Expires in Tax Year 2020 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	190,072
Expires in Tax Year 2021 [Member]
Net Operating Loss
Expires in Tax Year 2021 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	126,620
Expires in Tax Year 2022 [Member]
Net Operating Loss
Expires in Tax Year 2022 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	48,573
Expires in Tax Year 2023 [Member]
Net Operating Loss
Expires in Tax Year 2023 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	107,172
Expires in Tax Year 2024 [Member]
Net Operating Loss
Expires in Tax Year 2024 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	156,392
Expires in Tax Year 2025 [Member]
Net Operating Loss
Expires in Tax Year 2025 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	155,394
Expires in Tax Year 2026 [Member]
Net Operating Loss
Expires in Tax Year 2026 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	139,885
Expires in Tax Year 2027 [Member]
Net Operating Loss
Expires in Tax Year 2027 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	154,991
Expires in Tax Year 2028 [Member]
Net Operating Loss
Expires in Tax Year 2028 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	152,732
Expires in Tax Year 2029 [Member]
Net Operating Loss
Expires in Tax Year 2029 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	68,676
Expires in Tax Year 2030 [Member]
Net Operating Loss
Expires in Tax Year 2030 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	31,081
Expires in Tax Year 2031 [Member]
Net Operating Loss	302,190
Expires in Tax Year 2031 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	44,712
Expires in Tax Year 2032 [Member]
Net Operating Loss	999,973
Expires in Tax Year 2032 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	59,085
Expires in Tax Year 2033 [Member]
Net Operating Loss	1,155,716
Expires in Tax Year 2033 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	71,062
Expires in Tax Year 2034 [Member]
Net Operating Loss	472,315
Expires in Tax Year 2034 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	73,198
Expires in Tax Year 2035 [Member]
Net Operating Loss	99,688
Expires in Tax Year 2035 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	76,429
Expires in Tax Year 2036 [Member]
Net Operating Loss
Expires in Tax Year 2036 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	73,315
Expires in Tax Year 2037 [Member]
Net Operating Loss
R&D & Other Credits	117,000
Expires in 2038 and Beyond [Member] | Research & Development & Other Tax Credits [Member]
Net Operating Loss
R&D & Other Credits	$ 114,074