Consolidated Statement of Stockholders' Equity (Deficit) (Parentheticals)	12 Months Ended
	Dec. 31, 2018 shares
Issuance of Class A Stock [Member]
Issuance of shares, shares (in shares)	16,046,624
Issuance of Class B Stock [Member]
Issuance of shares, shares (in shares)	15,486,560
Issuance of Class A Stock, Two [Member]
Issuance of shares, shares (in shares)	16,668,000
Shares cancelled (in shares)	6,384,877
Issuance of shares, shares (in shares)	16,668,000
Vesting restricted units, shares (in shares)	144,667