Note 7 - Debt - Summary of Long-term Debt (Details) (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Real Estate Loan 1 [Member]
Interest rate	5.75%	5.75%
Monthly principal and interest payment	$ 5,255	$ 5,255
Vehicle Loans for Trucks [Member]
Interest rate	8.59%	8.59%
Monthly principal and interest payment	$ 3,966	$ 3,966
Note Payable To Seller Of Heat Waves [Member]
Monthly principal and interest payment	$ 36,000	$ 36,000
Seller Subordinated Note [Member] | Subordinated Debt [Member]
Interest rate		8.00%
Subordinated Promissory Note 1 [Member] | Subordinated Debt [Member]
Interest rate	10.00%	10.00%
Subordinated Promissory Note 2 [Member] | Subordinated Debt [Member]
Interest rate	10.00%	10.00%
Subordinated Promissory Note 3 [Member] | Subordinated Debt [Member]
Interest rate	10.00%