Note 4 - Non-operating Income (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain (Loss) on Acquisition of Equity Method Investment			$ 1,975,000	$ 2,050,000	$ (0)
Nonoperating Income (Expense) [Member]
Gain (Loss) on Acquisition of Equity Method Investment	$ 1,975,000
Caris [Member]
Equity Method Investment, Ownership Percentage			75.10%
Loss Contingency, Damages Paid, Value				$ 8,364,000
Psychiatric Hospital in Osage Beach, Missouri [Member]
Gain (Loss) on Acquisition of Equity Method Investment		$ 2,050,000