Note 9 - Basic and Diluted Loss Per Share (Details Textual) - shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Weighted Average Number Diluted Shares Outstanding Adjustment, Total (in shares)	0
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	695,204	419,600
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	130,362	895,113