Note 13 - Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details)	Dec. 31, 2020 USD ($)
State and Local Jurisdiction [Member]
Net Operating Loss	$ 2,065,423
State and Local Jurisdiction [Member] | Research & Development & Other Tax Credits [Member]
Net Operating Loss	42,000
Expires in Tax Year 2021 [Member] | Research & Development & Other Tax Credits [Member]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
Expires in Tax Year 2029 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss	191,519
Expires in Tax Year 2030 [Member] | Research & Development & Other Tax Credits [Member]
Net Operating Loss	3,000
Expires in Tax Year 2030 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss	414,231
Expires in Tax Year 2031 [Member] | Research & Development & Other Tax Credits [Member]
Net Operating Loss	3,000
Expires in Tax Year 2031 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss	641,229
Expires in Tax Year 2032 [Member] | Research & Development & Other Tax Credits [Member]
Net Operating Loss	3,000
Expires in Tax Year 2032 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2033 [Member] | Research & Development & Other Tax Credits [Member]
Net Operating Loss	3,000
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]
Net Operating Loss	3,000
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]
Net Operating Loss
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]
Net Operating Loss
Expires in Tax Year 2036 [Member] | State and Local Jurisdiction [Member]
Net Operating Loss
Expires in Tax Year 2036 and Beyond [Member] | Research & Development & Other Tax Credits [Member]
Net Operating Loss
Expires in Tax Year 2036 and Beyond [Member] | State and Local Jurisdiction [Member]
Net Operating Loss