Note 1 - Nature of Operations (Details Textual) - USD ($) |
6 Months Ended | |||
|---|---|---|---|---|
Feb. 08, 2021 |
Feb. 04, 2021 |
Jan. 28, 2021 |
Jun. 30, 2021 |
|
| Common Stock [Member] | ||||
| Stock Issued During Period, Shares, New Issues (in shares) | 2,530,000 | |||
| The 2021 Offering [Member] | Lake Street Capital Markets, LLC and Northland Securities, Inc. [Member] | ||||
| Proceeds from Issuance of Common Stock, Net | $ 27,600,000 | |||
| The 2021 Offering [Member] | Lake Street Capital Markets, LLC and Northland Securities, Inc. [Member] | Common Stock [Member] | ||||
| Stock Issued During Period, Shares, New Issues (in shares) | 2,530,000 | |||
| Revolving Credit Facility [Member] | ||||
| Debt Instrument, Collateral Amount | $ 750,000 | |||
| Line of Credit Facility, Commitment Fee Percentage | 5.00% |