Note 3 - Leases - Maturities of Lease Liabilities (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
2020 (remaining 6 months)	$ 529,443
2020 (remaining 6 months)	21,210
2021	885,165
2021	42,421
2022	805,270
2022	40,848
2023	761,361
2023	36,211
2024	610,822
2024	37,156
Thereafter	3,041,218
Thereafter	32,650
Total payment under lease agreements	6,633,279
Total payment under lease agreements	210,496
Less imputed interest	(1,724,215)
Less imputed interest	(20,075)
Total lease liability	4,909,064	$ 5,141,540
Total lease liability	$ 190,421	$ 207,045