Note 12 - Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details)	Dec. 31, 2017 USD ($)
Research & Development & Other Tax Credits [Member]
R&D & Other Credits	$ 2,150,820
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss	128,962
State and Local Jurisdiction [Member]
Net Operating Loss	1,130,795
Expires in Tax Year 2018 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	166,019
Expires in Tax Year 2018 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2018 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2019 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	198,072
Expires in Tax Year 2019 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2019 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2020 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	126,620
Expires in Tax Year 2020 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2020 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2021 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	48,573
Expires in Tax Year 2021 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2021 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2022 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	107,172
Expires in Tax Year 2022 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2022 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2023 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	156,392
Expires in Tax Year 2023 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2023 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2024 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	155,394
Expires in Tax Year 2024 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2024 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2025 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	139,885
Expires in Tax Year 2025 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2025 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2026 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	154,991
Expires in Tax Year 2026 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2026 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2027 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	152,732
Expires in Tax Year 2027 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2027 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2028 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	68,676
Expires in Tax Year 2028 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2028 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2029 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	31,081
Expires in Tax Year 2029 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2029 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2030 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	44,712
Expires in Tax Year 2030 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2030 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2031 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	59,085
Expires in Tax Year 2031 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2031 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2032 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	71,062
Expires in Tax Year 2032 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2032 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss	312,351
Expires in Tax Year 2033 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	73,198
Expires in Tax Year 2033 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2033 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss	532,837
Expires in Tax Year 2034 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	76,429
Expires in Tax Year 2034 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss	29,274
Expires in Tax Year 2034 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss	285,607
Expires in Tax Year 2035 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	73,315
Expires in Tax Year 2035 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss	99,688
Expires in Tax Year 2035 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2036 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	117,000
Expires in Tax Year 2036 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2036 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2037 [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits
Expires in Tax Year 2037 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in Tax Year 2037 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in 2038 and Beyond [Member] | Research & Development & Other Tax Credits [Member]
R&D & Other Credits	130,412
Expires in 2038 and Beyond [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss
Expires in 2038 and Beyond [Member] | State and Local Jurisdiction [Member]
Net Operating Loss