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Note 7 - Leases (Details Textual) - USD ($)		3 Months Ended		9 Months Ended
Note 7 - Leases (Details Textual) - USD ($)	Jan. 01, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Lease, Weighted Average Remaining Lease Term		1 year 328 days		1 year 328 days
Operating Lease, Weighted Average Discount Rate, Percent		5.20%		5.20%
Operating Lease, Payments				$ 206,400
Lessor, Operating Lease, Term of Contract	7 years
Lessor, Operating Lease, Renewal Term	5 years
Revenue from Contract with Customer, Excluding Assessed Tax, Total		$ 9,148,865	$ 8,337,045	26,895,382	$ 26,800,025
Lease Revenue Billed [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total		$ 145,000		$ 305,000
Minimum [Member]
Lessee, Operating Lease, Term of Contract		1 year		1 year
Operating Lease, Lease Income, Lease Payments	$ 193,000
Maximum [Member]
Lessee, Operating Lease, Term of Contract		5 years		5 years
Operating Lease, Lease Income, Lease Payments	$ 410,000