Consolidated Balance Sheet (Unaudited) (Parentheticals) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	40,796,179	40,453,462
Common stock, shares outstanding (in shares)	40,796,179	40,453,462