Note 8 - Leases - Maturities of Lease Liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
2021, financing	$ 175,000
2021, operating	1,020,000
2021	1,195,000
2022, financing	170,000
2022, operating	1,011,000
2022	1,181,000
2023, financing	97,000
2023, operating	1,014,000
2023	1,111,000
2024, financing	53,000
2024, operating	856,000
2024	909,000
2025, financing	25,000
2025, operating	752,000
2025	777,000
Thereafter, financing	0
Thereafter, operating	8,228,000
Thereafter	8,228,000
Total undiscounted future minimum lease cash payments, financing	520,000
Total undiscounted future minimum lease cash payments, operating	12,881,000
Total undiscounted future minimum lease cash payments, operating	13,401,000
Present value discount, financing	(9,000)
Present value discount, operating	(4,320,000)
Present value discount	(4,329,000)
Lease liability, financing	510,526		$ 481,830
Lease liability, operating	8,560,892	$ 9,105,503	$ 9,655,304
Lease liability	$ 9,072,000