Note 5 - PNC Credit Facility - Summary of Quarterly Leverage Ratio (Details) - Two Thousand Fourteen Credit Agreement [Member]	3 Months Ended			6 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017
Minimum [Member]
Maximum leverage ratio				4.5
Minimum [Member] | Scenario, Forecast [Member]
Maximum leverage ratio	5.5	7	4.5
Maximum [Member]
Maximum leverage ratio				1
Maximum [Member] | Scenario, Forecast [Member]
Maximum leverage ratio	1	1	1