Note 12 - Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details)	Dec. 31, 2018 USD ($)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss	$ 509,068
State and Local Jurisdiction [Member]
Net Operating Loss	756,975
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	2,319
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	3,000
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	3,000
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	3,000
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	3,000
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	3,000
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	3,000
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	86,366
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	152,732
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	68,676
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	31,081
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	44,712
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	59,085
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	71,062
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	73,198
Expires in Tax Year 2034 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss	38,127
Expires in Tax Year 2034 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss	76,429
Expires in Tax Year 2035 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss	111,708
Expires in Tax Year 2035 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss	73,315
Expires in Tax Year 2036 and Beyond [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss	359,233
Expires in Tax Year 2036 [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Net Operating Loss