Note 5 - Operating Leases, and Long-term Debt and Equipment Financing - Lease-related Assets and Liabilities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Operating lease assets	$ 543,465
Equipment financing assets	90,266
Total lease assets	633,731
Operating	96,566
Current portion of long-term debt and equipment financing	25,949	48,262
Operating	446,899
Noncurrent long-term debt and equipment financing	22,096	$ 36,302
Total lease liabilities	$ 591,510
Operating leases (in years) (Year)	4 years 91 days
Equipment financing (in years) (Year)	1 year 244 days
Operating leases	2.45%
Equipment financing	7.62%