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Note 9 - Industry Segment Data - Segment Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Revenue from Contract with Customer, Including Assessed Tax $ 32,980,607 $ 28,150,817 $ 39,995,580 $ 40,975,320 $ 42,203,066 $ 43,326,080 $ 53,432,029 $ 48,193,318 $ 142,102,324 $ 187,154,493
Operating profit (loss)                 (6,857,462) 6,383,442
Interest expense                 (4,806) (17,546)
Interest and other income                 19,260 440,503
TOTAL EARNINGS (LOSS) BEFORE INCOME TAXES                 (6,838,202) 6,823,945
Identifiable assets 77,344,088       86,601,982       77,344,088 86,601,982
Depreciation                 1,524,961 1,340,492
Capital expenditures                 4,935,361 807,989
Coil [Member]                    
Revenue from Contract with Customer, Including Assessed Tax                 99,762,892 124,555,478
Tubular [Member]                    
Revenue from Contract with Customer, Including Assessed Tax                 42,339,432 62,599,015
Operating Segments [Member]                    
Operating profit (loss)                 (4,312,213) 8,743,267
Identifiable assets 59,553,967       74,623,960       59,553,967 74,623,960
Operating Segments [Member] | Coil [Member]                    
Revenue from Contract with Customer, Including Assessed Tax                 99,762,892 124,555,478
Operating profit (loss)                 1,252,669 6,414,396
Identifiable assets 35,894,510       43,104,205       35,894,510 43,104,205
Depreciation                 836,730 551,241
Capital expenditures                 4,060,911 396,299
Operating Segments [Member] | Tubular [Member]                    
Revenue from Contract with Customer, Including Assessed Tax                 42,339,432 62,599,015
Operating profit (loss)                 (5,564,882) 2,328,871
Identifiable assets 23,659,457       31,519,755       23,659,457 31,519,755
Depreciation                 675,048 782,327
Capital expenditures                 841,817 377,400
Corporate, Non-Segment [Member]                    
General corporate expenses                 (2,540,443) (2,342,279)
Identifiable assets $ 17,790,121       $ 11,978,022       17,790,121 11,978,022
Depreciation                 13,183 6,924
Capital expenditures                 $ 32,633 $ 34,290