Note 8 - Leases - Maturities of Lease Liabilities (Details) - USD ($)	Sep. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Remainder of 2019, financing	$ 30,000
Remainder of 2019, operating	263,000
Remainder of 2019, total	293,000
2020, financing	117,000
2020, operating	862,000
2020, total	979,000
2021, financing	118,000
2021, operating	838,000
2021, total	956,000
2022, financing	112,000
2022, operating	827,000
2022, total	939,000
2023, financing	38,000
2023, operating	834,000
2023, total	872,000
2024, financing
2024, operating	9,923,000
2024, total	9,923,000
Total undiscounted future minimum lease cash payments, financing	415,000
Total undiscounted future minimum lease cash payments, operating	13,547,000
Total undiscounted future minimum lease cash payments, total	13,962,000
Present value discount, financing	(16,000)
Present value discount, operating	(4,310,000)
Present value discount, total	(4,326,000)
Lease liability, financing	399,046	$ 453,485
Operating lease liability	9,236,695	$ 9,490,385	$ 10,100,000
Lease liability, total	$ 9,636,000