Note 8 - Leases - Maturities of Lease Liabilities (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Remainder of: 2020, financing	$ 66,000
Remainder of: 2020, operating	522,000
Remainder of: 2020, total	588,000
2021, financing	132,000
2021, operating	1,020,000
2021, total	1,152,000
2022, financing	126,000
2022, operating	1,011,000
2022, total	1,137,000
2023, financing	53,000
2023, operating	1,002,000
2023, total	1,055,000
2024, financing	10,000
2024, operating	856,000
2024, total	866,000
Thereafter, financing	0
Thereafter, operating	8,979,000
Therafter, total	8,979,000
Total undiscounted future minimum lease cash payments, financing	387,000
Total undiscounted future minimum lease cash payments, operating	13,390,000
Total undiscounted future minimum lease cash payments, Total	13,777,000
Present value discount, financing	(11,000)
Present value discount, operating	(4,554,000)
Present value discount, Total	(4,565,000)
Lease liability, financing	376,472	$ 438,580
Operating lease liabilities	8,836,193	$ 9,105,503
Lease liability, Total	$ 9,212,000