Note 2 - Revenue from Contracts with Customers (Details Textual) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Dec. 31, 2019 |
|
| Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 0 | $ 0 |
| Contract with Customer, Liability, Current | 270,791 | 464,223 |
| Contract with Customer, Liability, Revenue Recognized | 212,568 | |
| Prepaid Expenses and Other Current Assets [Member] | ||
| Deferred Costs of Revenue | $ 246,351 | $ 453,607 |
| X | ||||||||||
- Definition Amount of deferred costs of revenue as of the balance sheet date. No definition available.
|
| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. 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
|