Note 9 - Leases (Details Textual) - USD ($)		12 Months Ended
Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018
Lease, Cost, Total		$ 305,992	$ 326,724
Operating Lease, Weighted Average Remaining Lease Term		1 year 273 days
Operating Lease, Weighted Average Discount Rate, Percent		5.20%
Operating Lease, Payments		$ 263,700
Lessor, Operating Lease, Term of Contract	7 years
Lessor, Operating Lease, Renewal Term	5 years
Revenue from Contract with Customer, Excluding Assessed Tax, Total		$ 35,055,315	$ 36,115,741
Lessor, Operating Lease, Remaining Lease Term		6 years
Lease Revenue Billed [Member]
Revenue from Contract with Customer, Excluding Assessed Tax, Total		$ 437,700
Minimum [Member]
Lessee, Operating Lease, Term of Contract		1 year
Operating Lease, Lease Income, Lease Payments	$ 193,000
Maximum [Member]
Lessee, Operating Lease, Term of Contract		5 years
Operating Lease, Lease Income, Lease Payments	$ 410,000

The remaining lease term for operating lease of the lessor.

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Amount of lease cost recognized by lessee for lease contract.

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-SubTopic 20
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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of operating lease income from lease payments paid and payable to lessor. Excludes variable lease payments not included in measurement of lease receivable.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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