Note 4 - Revenue From Contracts With Customers - Changes in Contract Liabilities (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Total deferred revenue, beginning of period | $ 26,061 | $ 41,098 |
| Impact of adoption of ASU 2014-09 and related standards | 700,000 | |
| Revenue recognized from satisfaction of performance obligations | (15,037) | (15,037) |
| Total deferred revenue, end of period | $ 711,024 | $ 26,061 |
| X | ||||||||||
- Definition Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from from the adoption of a new accounting pronouncement. No definition available.
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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