Note 2 - Revenue from Contracts with Customers (Details Textual) - USD ($) |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2019 |
Dec. 31, 2018 |
|
| Contract with Customer, Asset, Net, Current, Total | $ 498,681 | $ 498,681 | $ 0 |
| Contract with Customer, Liability, Current | 486,362 | 486,362 | 318,552 |
| Contract with Customer, Liability, Revenue Recognized | 63,366 | 318,552 | |
| Capitalized Contract Cost, Net, Total | 0 | 0 | 3,480 |
| Prepaid Expenses and Other Current Assets [Member] | |||
| Deferred Costs of Revenue | $ 532,791 | $ 532,791 | $ 294,115 |
| X | ||||||||||
- Definition Amount of deferred costs of revenue as of the balance sheet date. No definition available.
|
| X | ||||||||||
- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| 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://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|