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Note 10 - Leases - Operating Lease Balance Sheet Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating lease cost	$ 42,981
Short-term lease cost	16,295
Sublease income
Total lease cost	59,276
Operating lease right-of-assets	568,073	$ 602,937	$ 0
Operating lease liabilities, current portion	138,274	135,519	0
Operating lease liabilities, net of current portion	419,171	$ 454,823	$ 0
Total	$ 557,445
Weighted average remaining lease term (in years) – operating leases (Year)	4 years 40 days
Weighted average discount rate – operating leases	5.50%

X

- Definition

Amount of lease cost recognized by lessee for lease contract.

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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X

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of lessee's right to use underlying asset under operating lease.

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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 of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of sublease income excluding finance and operating lease expense.

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