Note 17 - Subsequent Events (Details Textual) - Bank One [Member] - USD ($) $ in Millions	1 Months Ended
	Apr. 01, 2020	Jan. 01, 2021	Feb. 29, 2020
Line of Credit Facility, Maximum Borrowing Capacity			$ 25
Forecast [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 25
Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 50
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.25%
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.90%