Note 7 - Debt - Summary of Long-term Debt (Details) (Parentheticals) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Real Estate Loan 1 [Member]
Interest rate		5.75%
Monthly principal and interest payment		$ 5,254,640
Vehicle Loans for Trucks [Member]
Interest rate		8.59%
Monthly principal and interest payment		$ 3,966,000
Note Payable To Seller Of Heat Waves [Member]
Monthly principal and interest payment	$ 36,000,000	$ 36,000,000
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%