Note 2 - Revenue from Contracts with Customers - Changes in Contract Liabilities (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Jun. 30, 2020 |
Mar. 31, 2020 |
|
| Contract liabilities, balance | $ 270,791 | $ 464,223 |
| Contract liabilities added | 9,906 | 19,136 |
| Revenue recognized | (216,353) | (212,568) |
| Contract liabilities, balance | $ 64,344 | $ 270,791 |
| X | ||||||||||
- Definition Additions in the period to the contract with customer, liability. No definition available.
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. 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
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