Note 19 - Subsequent Events	6 Months Ended
Jun. 30, 2021
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 19. SUBSEQUENT EVENTS On August 2, 2021, Yellowstone announced it has entered into a business combination agreement with Sky Harbour LLC (“SHG”), a developer of private aviation infrastructure focused on building, leasing and managing business aviation hangars. Upon closing of the business combination, SHG will become a publicly traded company, and it is expected that its common stock will be listed on the NASDAQ exchange. The combined company will have an implied pro forma equity market value of approximately $777 million at closing. We have agreed to provide $55 million of financing in support of the transaction, which will be funded prior to the closing of the business combination, assuming SHG successfully raises at least $80 million in a private activity bond offering. This additional equity investment will initially be directly into SHG, and upon the successful consummation of the business combination will convert into 5,500,000 shares of the post-combination public company’s Class A common stock, at a price of $10 per share. In the event the business combination is not consummated, our investment will remain as Series B Preferred units of SHG. In addition, the parties will seek to raise additional funding to support the business combination through a private placement investment (“PIPE”) to be consummated at the closing of the transaction of $100 million. In addition to the $55 million of financing support, we have also agreed to provide to SHG a backstop valued at up to an additional $45 million through the purchase of additional shares of Yellowstone Class A common stock at a price of $10 per share if needed to meet the minimum investment condition of $150 million in cash and securities to SHG at the closing. The combined company expects to receive up to $238 million in gross proceeds, assuming no redemptions of Yellowstone’s existing public stockholders. This amount excludes additional funds which may be raised in the PIPE. All SHG equityholders are retaining 100% of their equity in the combined company. The cash proceeds are expected to be used to fund the completion of four initial airport hangar campuses in addition to expansion at SHG’s location currently in operation. The transaction has been unanimously approved by the Yellowstone Board of Directors, as well as the Board of Managers and all equityholders of SHG, and is subject to the satisfaction of customary closing conditions, including the approval of the shareholders of Yellowstone and the receipt by SHG of at least $80 million in a private activity bond financing currently expected to close in September.

Note 19 - Subsequent Events

6 Months Ended

Jun. 30, 2021

NOTE 19. SUBSEQUENT EVENTS

On August 2, 2021, Yellowstone announced it has entered into a business combination agreement with Sky Harbour LLC (“SHG”), a developer of private aviation infrastructure focused on building, leasing and managing business aviation hangars. Upon closing of the business combination, SHG will become a publicly traded company, and it is expected that its common stock will be listed on the NASDAQ exchange. The combined company will have an implied pro forma equity market value of approximately $777 million at closing.

We have agreed to provide $55 million of financing in support of the transaction, which will be funded prior to the closing of the business combination, assuming SHG successfully raises at least $80 million in a private activity bond offering. This additional equity investment will initially be directly into SHG, and upon the successful consummation of the business combination will convert into 5,500,000 shares of the post-combination public company’s Class A common stock, at a price of $10 per share. In the event the business combination is not consummated, our investment will remain as Series B Preferred units of SHG. In addition, the parties will seek to raise additional funding to support the business combination through a private placement investment (“PIPE”) to be consummated at the closing of the transaction of $100 million. In addition to the $55 million of financing support, we have also agreed to provide to SHG a backstop valued at up to an additional $45 million through the purchase of additional shares of Yellowstone Class A common stock at a price of $10 per share if needed to meet the minimum investment condition of $150 million in cash and securities to SHG at the closing.

The combined company expects to receive up to $238 million in gross proceeds, assuming no redemptions of Yellowstone’s existing public stockholders. This amount excludes additional funds which may be raised in the PIPE. All SHG equityholders are retaining 100% of their equity in the combined company. The cash proceeds are expected to be used to fund the completion of four initial airport hangar campuses in addition to expansion at SHG’s location currently in operation.

The transaction has been unanimously approved by the Yellowstone Board of Directors, as well as the Board of Managers and all equityholders of SHG, and is subject to the satisfaction of customary closing conditions, including the approval of the shareholders of Yellowstone and the receipt by SHG of at least $80 million in a private activity bond financing currently expected to close in September.