Note 6 - Leases - Maturities of Lease Liabilities (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Remainder of: 2021, financing	$ 107,000
Remainder of: 2021, operating	523,000
Remainder of: 2021, total	630,000
2022, financing	206,000
2022, operating	1,049,000
2022, total	1,255,000
2023, financing	132,000
2023, operating	1,053,000
2023, total	1,185,000
2024, financing	89,000
2024, operating	894,000
2024, total	983,000
2025, financing	61,000
2025, operating	790,000
2025, total	851,000
Thereafter, financing	9,000
Thereafter, operating	8,241,000
Therafter, total	8,250,000
Total undiscounted future minimum lease cash payments, financing	604,000
Total undiscounted future minimum lease cash payments	12,550,000
Total undiscounted future minimum lease cash payments	13,154,000
Present value discount, financing	(10,000)
Present value discount, operating	(4,100,000)
Present value discount, Total	(4,110,000)
Finance lease liabilities	593,856	$ 510,526
Operating lease liabilities	8,449,519	$ 8,560,892
Lease liability, Total	$ 9,044,000